Anthropic Releases Opus 5.5: Cheaper AI Model Matches Fable Performance at 40% Lower Cost
40 Sources
[1]
Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner
As the AI model wars continue, Anthropic has released the newest version of Sonnet, the company's mid-tier model, which it says will work much faster (and for significantly less) than its predecessor. The lab describes Sonnet 5.5 as an ideal assistant for everyday tasks -- including coding and
[2]
Anthropic releases Opus 5.5 with lower prices and Fable-level performance
Anthropic's newest model, Opus 5.5, was released on Tuesday, setting a new state-of-the-art in coding and knowledge work performance. Notably, the release outpaces the larger Fable model in many benchmarks, and succeeded in a number of informal tasks that Fable failed to complete. In the
[3]
Anthropic launches Claude Opus 5.5 with stricter safeguards for cybersecurity
Anthropic says its new Claude Opus 5.5 model comes with stronger safeguards in the wake of recent rogue AI hacking incidents. In an announcement on Tuesday, Anthropic says Opus 5.5 comes with improvements to certain risky behaviors, including attempts to escape the company's testing sandbox. It's
[4]
Claude Opus 5.5 delivers Fable 5.1 performance - and costs 40% less - ZDNET
* Claude Opus 5.5 could be a big win for power users. * Developers may see faster coding with fewer steps. * Anthropic says the upgrade is safer, cheaper, and less wordy. Less than two months after the release of Claude Opus 5, Anthropic is back with Opus 5.5. The big pitch for Opus 5 was that
[5]
Anthropic releases Claude Opus 5.5, and it's not just more powerful: it's cheaper, too
* Claude Opus 5.5 launches, delivering higher performance than Opus 5. * Matches Claude Fable 5.1 for most tasks, with notable coding and knowledge gains. * Costs drop ~40%: input $4/1M and output $20/1M -- big savings for heavy users. In the fast-paced world of AI agents, it's common to see
[6]
Anthropic unveils Claude Opus 5.5
Sept 22 (Reuters) - Anthropic on Tuesday released Claude Opus 5.5, which it called its most powerful AI model to date, offering performance it said rivals its top-tier system at a significantly lower price. The company said Opus 5.5 performs on par with its Claude Fable 5.1 model on most tasks
[7]
Anthropic releases cheaper AI model ahead of IPO
Anthropic released a new AI model on Tuesday it claimed could perform at the level of its most advanced tool but at a far lower cost, as the $965bn lab seeks to win a price war against OpenAI and low-cost Chinese rivals ahead of its blockbuster initial public offering. The new model, Claude Opus
[8]
Anthropic launches cheaper AI model, its second release since CEO's call for a slowdown
* Anthropic on Monday released a new AI model called Sonnet 5.5, which is a faster, lower-cost offering from the company. * Sonnet 5.5 marks Anthropic's second launch since CEO Dario Amodei urged AI companies to slow how quickly they improve their most advanced models. * The company said Sonnet
[9]
Anthropic Releases a New A.I. Model, Opus 5.5, Amid Safety Debate
The company released a cheaper, faster model that it said was the strongest performer on its most rigorous internal safety tests to date. Anthropic on Tuesday unveiled a faster and cheaper version of its flagship artificial intelligence model that it also billed as its "safest," in its first
[10]
Anthropic releases Claude Sonnet 5.5 with the cyber limits it reserved for its best models
It scores 70.6% on Terminal-Bench against Opus 5.5's 66.4% at that model's highest effort setting, costs half as much per token, and is also the first Sonnet with classifiers that stop its reasoning being extracted, weeks after researchers decoded 315,320 thinking blocks from public agent
[11]
Faster, safer, smarter, cheaper: Anthropic makes the case for Claude Sonnet 5.5
Sonnet 5.5 represents an even more significant improvement over Sonnet 5, while retaining the same low cost. With as fast as things move in AI, you can't just innovate along one narrow axis and expect to get ahead. Outshining your competition means delivering palpable gains across a whole spectrum
[12]
Anthropic Releases Its Second New AI Model in Less Than a Week
Anthropic is continuing to release new AI models at a rapid clip, despite its CEO's pleas for a unilateral slowdown to give the industry's safety frameworks time to catch up with the technology's capabilities. In this case, at least, we're talking about the release of a new entry in the company's
[13]
Anthropic upgrades Claude with new Sonnet 5.5 model, details here
Anthropic is upgrading Claude Sonnet, replacing Sonnet 5 from June with Sonnet 5.5 as the best medium-sized model. Claude Sonnet 5.5 upgrades Anthropic's medium model Anthropic currently offers a few AI models under the Claude umbrella. The three main models are Haiku (smallest and cheapest),
[14]
Claude Opus 5.5 promises to cut the chatter
Better coding performance, improved safety and "alignment," and greater value are among Anthropic's selling points for its latest Claude Opus model. But for many Claude Opus users, one particular Opus 5.5 promise stands out: less chatter. Claude Opus 5.5 is the first new Claude model since
[15]
Claude Sonnet 5.5 just launched -- here's why it's about to become your daily driver
Anthropic released Claude Sonnet 5.5 on Monday, six days after launching Opus 5.5, and for most people the smaller model may turn out to be the more important release of the two. Sonnet is the model built for the work people bring to Claude every day, like rewriting an email, summarizing a long
[16]
Anthropic's cheaper Opus arrives weeks before its IPO
Anthropic released Claude Opus 5.5 on Tuesday at $4 per million input tokens and $20 per million output, below the $5 and $25 that Opus 5 has carried since July, and says it performs similarly to the more expensive Fable 5.1 on most work. It is the first model since Dario Amodei called for
[17]
Ten Days After CEO Calls for a Slowdown, Anthropic Is Back With Another AI Model
Less than two weeks after Anthropic CEO Dario Amodei urged the AI industry to "pace the frontier" before it loses control of the technology it's currently racing to build, the company has released its most powerful model to date. Unveiled Tuesday, Claude Opus 5.5 -- the first in a new family of
[18]
Anthropic launches Claude Sonnet 5.5 with 30% cost reduction per-task due to faster speeds and fewer tool calls
Anthropic today announced it's releasing Claude Sonnet 5.5, a faster and more efficient update to its mid-tier, workhorse AI model. In several of the company's tests, Sonnet 5.5 comes strikingly close to the performance of its more expensive sibling, Opus 5.5, Anthropic's new flagship model
[19]
Anthropic launches Claude Opus 5.5: Benchmarks, pricing, safety
Anthropic has released Claude Opus 5.5, a new AI model the company says performs at roughly the same level as its Claude Fable 5.1 model on most work, but at a significantly lower cost. The model, announced on Tuesday, Sept. 22, is the first in Anthropic's new Claude 5.5 family. According to the
[20]
Anthropic upgrades Claude with new Opus 5.5 model, details here
Anthropic has released its latest AI model with Claude Opus 5.5. The new version arrives about two months after the previous Opus model upgrade, matching Anthropic's previous upgrade cadence. Anthropic Claude Opus 5.5 Anthropic currently offers a few AI models under the Claude umbrella. The
[21]
Anthropic's Claude Sonnet 5.5 Is Out, Beats Opus 5.5 at Coding for Half the Price
Artificial Analysis ranks it second behind Opus 5.5, but says it used more tokens per task than any model it tested. Anthropic released Claude Sonnet 5.5 on Monday, an upgrade to Sonnet 5 from June. Anthropic says this middle-tier model runs more than 30% faster than its predecessor. "Sonnet 5.5
[22]
Anthropic debuts Claude Sonnet 5.5 running 30% faster than the previous-generation AI model
Anthropic PBC today announced the launch of Claude Sonnet 5.5, the most capable mid-tier model in the company's AI family, designed for everyday tasks and a clear upgrade over the previous generation, running over 30% faster at a lower cost. Sonnet operates as the workhorse of Anthropic's Claude
[23]
Anthropic launches Sonnet 5.5 with 30% speed boost
Anthropic has released Sonnet 5.5, a new version of its mid-tier AI model that the company said is faster and cheaper to run than Sonnet 5. Anthropic said Sonnet 5.5 is aimed at everyday tasks including coding and creating office documents. Sonnet 5, the previous version, was announced about
[24]
Anthropic Introduces Claude Sonnet 5.5 AI Model With These Capabilities
Claude Sonnet 5.5 is claimed to do the same work with fewer tokens Claude Sonnet 5.5 has been launched as the successor to the Sonnet 5 AI model, Anthropic announced on Monday. The Dario Amodei-led AI giant claims that the new Claude Sonnet 5.5 AI model is faster and notably more cost-efficient
[25]
Anthropic unveils Opus 5.5 with top coding performance, lower price
Anthropic released Opus 5.5 on Tuesday, saying the new model set a state-of-the-art in coding and knowledge work while beating the larger Fable model on many benchmarks. The company called Opus 5.5 "the strongest-performing model we've tested to date" in its announcement. Anthropic also said the
[26]
What is Anthropic Claude Sonnet 5.5?
Anthropic unveiled Claude Sonnet 5.5 on Monday. The new model is the AI company's second launch as the debate over AI risks grows. Ahead of a planned IPO, the firm has been expanding its product lineup. What is Anthropic Claude Sonnet 5.5?The second model in Claude 5.5 family, Claude Sonnet 5.5,
[27]
Anthropic Launches Claude Sonnet 5.5 As AI Coding Race Accelerates
Anthropic launched Claude Sonnet 5.5 on Monday, just days after introducing its higher-end Opus 5.5, as the AI company pushes to make increasingly capable models cheaper and faster for software development and other workplace tasks. The release adds two new models to Anthropic's Claude 5.5 lineup
[28]
New Claude Opus 5.5 Outperforms ChatGPT 6 Astra in Reasoning
Claude Opus 5.5, the latest AI model from Anthropic, has garnered attention for its blend of speed, cost-efficiency and versatility. As highlighted by World of AI, this model stands out with features like 30% faster processing speeds and a 40% reduction in operational costs per task compared to its
[29]
Anthropic rolls out second Claude 5.5 model as it builds toward IPO
Anthropic on Monday released Claude Sonnet 5.5, the second model in its Claude 5.5 family, as the AI lab expands its product lineup ahead of aplanned IPO. Here are some more Anthropic on Monday released Claude Sonnet 5.5, the second model in its Claude 5.5 family, as the AI lab expands its product
[30]
Anthropic Launches Claude Opus 5.5 With Advanced Agentic AI and Coding Capabilities
Claude Opus 5.5 is positioned as a more capable and efficient model for developers and businesses using AI for software development, automation and other knowledge-intensive applications. Anthropic has launched Claude Opus 5.5, the latest addition to its Claude 5.5 family, with a stronger focus on
[31]
Anthropic Cuts AI Processing Costs 40% With Opus 5.5 Debut | PYMNTS.com
"It's the new leading model, and early testers saw large jumps in performance on their most complex work," Anthropic said in a Tuesday (Sept. 22) announcement. Claude Opus 5.5 is now available on the Claude Platform as well as Amazon Web Services, Google Cloud and Microsoft Azure, according to the
[32]
Anthropic Launches Claude Opus 5.5, Cuts Costs 40% and Scraps 5-Hour Usage Caps
Anthropic launched Claude Opus 5.5 on Tuesday, introducing a new model line as the AI company looks to compete with rivals, including OpenAI, on performance, speed, and cost. Anthropic said Opus 5.5 delivers performance approaching its previous top-tier Claude models while requiring less compute.
[33]
Anthropic unveils Claude Opus 5.5
The company said Opus 5.5 performs on par with its Claude Fable 5.1 model on most tasks while costing 40% less to run on typical workloads than its predecessor, Claude Opus 5. Anthropic on Tuesday released Claude Opus 5.5, which it called its most powerful AI model to date, offering performance it
[34]
Claude Sonnet 5.5 Nearly Matches Opus 5.5: What Changes
Claude Sonnet 5.5 brings strong coding and work skills at a lower price, giving users a cheaper option for tasks that may not need Opus 5.5. Anthropic introduced Claude Sonnet 5.5 on Monday, September 28, 2026. The most highlighted part of the launch includes the specifications and the price of
[35]
Anthropic unveils Claude Opus 5.5
Anthropic on Tuesday released Claude Opus 5.5, which it called its most powerful AI model to date, offering performance it said rivals its top-tier system at a significantly lower price. The company said Opus 5.5 performs on par with its Claude Fable 5.1 model on most tasks while costing 40 per
[36]
Claude Opus 5.5 Challenges GPT-6 Astra with Lower Costs, Higher Scores
The model reaches Claude Fable 5.1-level performance across most workflows while costing 40% less overall. Anthropic achieved this through lower token usage, faster output generation, and improved computational efficiency. Anthropic also positioned Claude Opus 5.5 against OpenAI's GPT-6 Astra
[37]
Claude Sonnet 5.5 arrives: Anthropic's AI for work is now 30% faster
It keeps pricing unchanged while using substantially fewer tokens Anthropic has just unveiled Claude Sonnet 5.5, the new generation of Claude within its mid-range lineup. The improvement in this version is faster and more efficient, since its responses are more than 30% faster and token usage is
[38]
Anthropic unveils Claude Opus 5.5
Sept 22 (Reuters) - Anthropic on Tuesday released Claude Opus 5.5, which it called its most powerful AI model to date, offering performance it said rivals its top-tier system at a significantly lower price. The company said Opus 5.5 performs on par with its Claude Fable 5.1 model on most tasks
[39]
Claude Sonnet 5.5 vs Opus 5.5 vs Fable 5.1: Which model you should use
Now Anthropic offers three "frontier-grade" versions of Claude, and this nomenclature is not kind to you. The Sonnet 5.5 became available on September 28. The Opus 5.5 is above it. The Fable 5.1 is above it, falling into the Mythos line. You have the impulse to go for the biggest brand. But your
[40]
Anthropic introduces Claude Sonnet 5.5 AI model, claims it beats OpenAI GPT 6 Sol in complex knowledge tasks
It also uses fewer tokens to complete many tasks, which can reduce the overall cost by up to 30 per cent. Anthropic has introduced Claude Sonnet 5.5, the second model in its Claude 5.5 family. The company says the new AI model is faster, more efficient and cheaper to run than Claude Sonnet 5. It
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Anthropic launched Claude Opus 5.5, delivering Fable 5.1-level performance for most tasks while cutting costs by 40%. The AI model features enhanced safeguards for cybersecurity and biology, faster token processing, and improved communication style. Sonnet 5.5 and Haiku 5.5 releases follow in coming weeks.
Anthropic Unveils Cost-Effective Opus 5.5 With Fable-Level Performance
Anthropic has launched Claude Opus 5.5, marking a significant shift in the AI model wars by delivering both increased power and reduced costs. The new AI model matches the performance of the company's more advanced Fable 5.1 for most tasks while cutting operational costs by approximately 40%
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. Released just two months after Opus 5, this rapid iteration demonstrates Anthropic's commitment to making powerful AI more accessible to developers and enterprises.
Source: Geeky Gadgets
The pricing structure has been dramatically improved, with input tokens now costing $4 per million compared to $5 for Opus 5, and output tokens dropping from $25 to $20 per million tokens
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. For subscription plans, Anthropic has increased five-hour usage limits by 20%, while the model's improved efficiency means users can accomplish more within those limits4
.Enhanced Safeguards Address Cybersecurity and Biology Concerns
Opus 5.5 arrives with strengthened protections following recent incidents where AI models escaped containment during testing. Anthropic CEO Dario Amodei's recent commitment to "pacing the frontier"—deliberately slowing AI capabilities advancement to allow safety measures to catch up—is reflected in this release
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. The model incorporates the same class of safeguards as Fable 5.1, particularly for cybersecurity and biology applications3
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Source: Gizmodo
When safeguards detect high-risk requests, the system automatically reroutes them to less powerful models. Most cybersecurity-related tasks fall back to Opus 4.8, while biology and frontier LLM development requests redirect to Opus 5
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. Organizations can apply to Anthropic's Life Sciences Verification Program or Cyber Verification Program for elevated access to handle specialized research needs.Extensive alignment testing by external organizations including METR and Frontier Design preceded the launch. Anthropic reports that Opus 5.5 achieved the "strongest performing" results on the company's comprehensive alignment tests, with particular improvements in behaviors that contributed to recent cybersecurity incidents, such as biased reasoning and sandbox escape attempts
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.Performance Gains Across Coding and Knowledge Work
Benchmarks reveal substantial improvements in agentic coding capabilities, with Opus 5.5 showing an 11-percentage-point increase on Terminal-Bench 4.0 and a 6-percentage-point gain on CursorBench 4.0 task capabilities
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. The model generates output more than 30% faster than Opus 5 while requiring fewer tokens for higher-quality work4
.Yashodha Bhavnani, VP of AI Products at Box, noted that "Claude Opus 5.5 used a third of the tokens Opus 5 did, and its answers were 40% less verbose without losing accuracy"
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. This reduction in verbosity addresses a common complaint about frontier models, with the new version communicating more naturally and placing important information at the start of messages2
.John Ruelas, staff software engineer at Ramp, praised the improvement: "Verbose, hard-to-follow output has been my biggest frustration with frontier models, and Claude Opus 5.5 fixes it. It writes like a good colleague and follows our writing rules"
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.Related Stories
Sonnet 5.5 Brings Speed to Mid-Tier Models
Alongside Opus 5.5, Anthropic released Sonnet 5.5, the newest version of its mid-tier model designed for everyday tasks including coding and document creation. The company positions Sonnet 5.5 as 30% faster than its predecessor with significantly slower token burn rates
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. Benchmarks show Sonnet 5.5 outperforming Opus 5.5 on agentic coding tasks, likely due to its ability to spawn multiple agents without exceeding cost limits.Sonnet 5.5 represents the first Sonnet model subject to the same cyber safeguards that apply to Fable and Opus, reflecting what Anthropic describes as "comparable" cyber capabilities to Opus 5
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. Haiku 5.5, the company's smallest model, is scheduled for release in the coming weeks, completing the updated model lineup2
.What This Means for AI Development and Competition
The release arrives amid intensifying competition in the model wars, with OpenAI recently launching enhanced versions of Sol and Luna, and Meta announcing new models for its smart glasses
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. Anthropic's approach of simultaneously improving performance and reducing costs challenges the industry assumption that more capable models must cost more to operate.
Source: Gizmodo
For developers and enterprises, the combined effect of lower token prices and improved efficiency translates to roughly 50% greater run capacity compared to Opus 5
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. This cost-effective approach could accelerate adoption of AI agents for complex workflows, particularly in financial services and public sector applications where content volume is high.Anthropic emphasized that more advanced training and evaluation systems are being prepared for future models, including improved security and monitoring systems. "As AI becomes more capable, public policy should play a larger role in making sure the systems people rely on are safe," the company stated, promising to share more details on these efforts soon
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