Prices and claims are what each story reports; a company’s own benchmark stays a company claim. The claim check compares each maker’s main claim with an independent test that our story cites. Released models so far: 6 backed, 9 mixed, 12 not checked yet.

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September 2026

Sep 28
Claude Sonnet 5.5AnthropicReleasedFrontierCopy the link to this entry
The second Claude 5.5 model. Anthropic says it is more than 30% faster than Sonnet 5 and costs up to 30% less per task.
Claim check: MixedArtificial Analysis puts it two points behind Opus 5.5. At maximum effort it lists $5.46 per task (October 8), about 7% more than Sonnet 5; Anthropic’s savings figures refer mostly to lower effort settings.
Price $2 / $10 per million input / output tokens
Anthropic’s Sonnet 5.5 nears Opus at half the token price

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An entry appears when one of our stories covers a model launch, a preview, a reported plan, or a model becoming available on a new platform. A claim is Backed when an outside test supports it, Mixed when it holds only in part or only in some settings, and Disputed when an outside test contradicts it. The date is the one the story gives; when a story gives none, it is the story’s own date. We add entries with each edition and correct them under the story when a fact changes.

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