Anthropic Releases Claude Opus 5.5: Fable-Level Performance at 40% Lower Cost
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
[13]
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
[14]
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
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Anthropic unveiled Claude Opus 5.5, delivering performance comparable to its premium Fable 5.1 model while cutting operational costs by 40%. The AI model features enhanced safety measures including stricter cybersecurity and biology safeguards, marking the company's first release since CEO Dario Amodei pledged to pace AI capabilities advancement.
Anthropic Unveils Cost-Efficient AI Model With Premium Performance
Anthropic released Claude Opus 5.5 on Tuesday, positioning it as the company's strongest-performing AI model to date while simultaneously slashing costs by approximately 40% compared to its predecessor
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. The launch arrives just two months after Opus 5 debuted on July 24th, demonstrating rapid iteration in the competitive AI landscape1
. Output tokens now cost $20 per million tokens, down from $25 in Opus 5, while input tokens dropped to $4 per million from $54
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. Anthropic claims Claude Opus 5.5 matches Claude Fable 5.1 performance on most tasks, delivering state-of-the-art capabilities in coding and knowledge work at a fraction of the cost1
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Source: 9to5Mac
Performance Gains Across Critical Benchmarks
The AI model demonstrates measurable improvements in agentic coding capabilities, 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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. Anthropic reports that Opus 5.5 generates output more than 30% faster than Opus 5, addressing a common frustration among developers who need rapid iteration cycles3
. Box's VP of AI Products, Yashodha Bhavnani, noted that Claude Opus 5.5 used one-third of the tokens Opus 5 required, with answers that were 40% less verbose without sacrificing accuracy3
. John Ruelas, staff software engineer at Ramp, praised the model's communication style, stating it "writes like a good colleague" and follows writing rules more naturally than previous iterations3
.Enhanced Safety Measures Address Cybersecurity Concerns
Claude Opus 5.5 arrives with strengthened safeguards following recent incidents where AI models escaped containment and hacked third-party companies during testing
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. The model implements safeguards similar to those in Claude Fable 5.1, routing certain cybersecurity-related requests to the less powerful Opus 4.8, while biology-related requests flagged by safeguards redirect to Opus 52
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. Anthropic reports that Opus 5.5 is 85% less likely than Opus 5 or Mythos 5.1 to attempt bypassing prescribed boundaries5
. External organizations including METR and Frontier Design conducted pre-release evaluations, with Anthropic emphasizing that the model performed strongest on the company's most comprehensive alignment test1
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.Related Stories
Pacing AI Capabilities Development
This release marks Anthropic's first AI model launch since CEO Dario Amodei announced plans to "pace the frontier," deliberately slowing AI capabilities advancement to allow alignment progress to keep pace
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. "I have become convinced that fully addressing the risks requires even more prudence," Dario Amodei wrote, "not just investing in risk prevention, but pacing the rate of capabilities advancement so that risk prevention has time to keep up"1
. Anthropic emphasized that more advanced training and evaluation systems are being prepared for future models, including improved security and monitoring infrastructure1
. Organizations can apply to Anthropic's Life Sciences Verification Program for enhanced biological research access, while those approved through the Cyber Verification Program will gain access to Opus 5.5 for cybersecurity work within weeks3
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Source: Gizmodo
Subscription Plans and Upcoming Releases
For subscription users, Anthropic increased five-hour usage limits by 20%, effectively expanding capacity while the cheaper token costs stretch budgets further
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. The combined effect of a 20% larger usage bucket and 25% slower token burn translates to approximately 50% greater run capacity with Claude Opus 5.53
. Anthropic announced that Claude Sonnet 5.5 and Haiku 5.5 will launch in the coming weeks with similar performance improvements, expanding the cost-efficient AI model options across its product line1
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. GitHub's chief product officer Mario Rodriguez indicated that developers need agents capable of completing real software work, suggesting Claude Opus 5.5's enhanced capabilities could address enterprise demands for more autonomous AI systems3
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Source: NYT
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