Claude Sonnet 5.5

Anthropic's new everyday model, more than 30% faster than Sonnet 5 and cheaper for most work, available in Claude Code and the API.

Second model in the Claude 5.5 family, positioned as the faster, lower-cost partner to Opus 5.5
Runs more than 30% faster than Sonnet 5 and costs up to 30% less for most work because it uses fewer tokens, while per-token pricing stays at $2 input and $10 output per million tokens
Handles up to 1M tokens of context and up to 128K tokens of output
In Claude Code it becomes the model behind the sonnet shortcut (version 2.1.284 and later) and runs at medium effort by default
Available on the Claude API as claude-sonnet-5-5, plus Amazon Bedrock, Google Cloud, and Microsoft Foundry
Developers moving from Sonnet 5 have a few breaking API changes to handle, covered in Anthropic's migration guide

Well-scoped everyday work like fixing bugs, iterating on features, and producing polished documents, slides, and spreadsheets.

The task is clear and repeatable and you want speed and lower cost. Switch to Opus 5.5 for long, judgment-heavy work.

Developers and teams running high-volume agent tasks like review, investigation, and drafting on a budget.

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Anthropicmodel

September 28, 2026·Source

Anthropic's new everyday model, more than 30% faster than Sonnet 5 and cheaper for most work, available in Claude Code and the API.

Second model in the Claude 5.5 family, positioned as the faster, lower-cost partner to Opus 5.5
Runs more than 30% faster than Sonnet 5 and costs up to 30% less for most work because it uses fewer tokens, while per-token pricing stays at $2 input and $10 output per million tokens
Handles up to 1M tokens of context and up to 128K tokens of output
In Claude Code it becomes the model behind the sonnet shortcut (version 2.1.284 and later) and runs at medium effort by default
Available on the Claude API as claude-sonnet-5-5, plus Amazon Bedrock, Google Cloud, and Microsoft Foundry
Developers moving from Sonnet 5 have a few breaking API changes to handle, covered in Anthropic's migration guide

Well-scoped everyday work like fixing bugs, iterating on features, and producing polished documents, slides, and spreadsheets.

The task is clear and repeatable and you want speed and lower cost. Switch to Opus 5.5 for long, judgment-heavy work.

Developers and teams running high-volume agent tasks like review, investigation, and drafting on a budget.

Pick a topic and leave with something you created.

Get new module drops and weekly AI strategy.