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Claude Opus 5.5

Anthropic's recommended default for most work, offering a 1,000,000-token context and a published retirement floor

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TrustList summary

Claude Opus 5.5 is the model Anthropic recommends for most work from 22 September 2026. It is available on the Claude API and through Amazon Bedrock, Google Cloud and Microsoft Foundry.

What Claude Opus 5.5 offers

  • Large context: a 1,000,000-token context window, with 128,000 output tokens on the synchronous endpoint and 300,000 on the batch endpoint behind a beta header.
  • Adaptive thinking: always on, with a default effort of medium.
  • Independent score: Artificial Analysis gives it 58 on version 4.3.2 of its Intelligence Index. It takes 260 million output tokens to finish the index, where the median is 88 million.

Customers and markets

Developers and organisations using Anthropic's API, or buying through one of the three cloud platforms.

Key facts

  • Training cut-off: June 2026.
  • Retirement floor: not sooner than 22 September 2027 on Anthropic-operated platforms.
  • Notice: Anthropic commits to giving at least 60 days' notice before retiring any public model.
  • Cloud dates: Amazon Bedrock and Google Cloud set their own retirement dates.
  • Settings: temperature, top_p and top_k return an error if set on this generation.

Summary written by TrustList from the business's own published information, Oct 2026.

Benchmarks & AI stats

AI model rankings
BenchmarkOfficialCommunity avg
Artificial Analysis Intelligence Index v4.3.2llm58 index-
Artificial Analysis Intelligence Index v5.0.1llm59 index-

“Official” values are editor-approved and feed the ranking. “Community avg” is the mean of member submissions (shown for transparency; it never affects the ranking until an editor approves a value).

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