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Claude Sonnet 5.5

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Mid-tier Anthropic model for everyday work, coding and document creation, with a 1 million token context window

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About Claude Sonnet 5.5

Claude Sonnet 5.5 is a mid-tier model from Anthropic, the second in its Claude 5.5 family and the successor to Sonnet 5. It is aimed at everyday work, coding and document creation. Artificial Analysis scored it below Claude Opus 5.5 on its independent index, while Anthropic's own benchmark figures are not independent.

Main features

  • Everyday tasks: positioned as the faster choice for routine work, coding and documents, finishing tasks in fewer steps.
  • Large context: a 1,000,000-token context window and up to 128,000 output tokens on the synchronous endpoint.
  • Input types: text and image input.
  • Adaptive thinking: reasoning effort adjusts to the task, with a default setting of high.
  • Access routes: the Claude API, Amazon Bedrock, Google Cloud and Microsoft Foundry, as served at launch.

Who it serves

Developers and teams that call the model through the Claude API or a cloud platform for coding, documents and everyday work.

Key facts

  • Developer: Anthropic.
  • Released: 28 September 2026.
  • Knowledge cutoff: June 2026, according to the models overview.
  • Retirement: not sooner than 28 September 2027 on Anthropic-operated platforms, while cloud providers set their own dates.

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

Benchmarks & AI stats

AI model rankings
BenchmarkOfficialCommunity avg
Artificial Analysis Intelligence Index v4.3.2llm56 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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Categories & features

Trust Score

4/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
18/100 · 20%
Engagement
0/100 · 15%
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Updated 9/29/2026

What the business tells TrustList

Founded
2026 (0 years) evidence sent

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