# Claude Sonnet 5.5

id: ent_claude-sonnet-5-5  
kind: product  
timeline: /timelines/claude-sonnet-5-5.md  
page: /record/claude-sonnet-5-5  
same_as: https://asof.is/record/claude-sonnet-5-5 (how to cite the id: /identifiers.md)  

second Claude 5.5 model, faster lower-cost complement to Opus 5.5

## Fact pages

One page per fact: the current value with its sources, then every dated value and what replaced what. Fetch any of them as markdown.

- [Claude Sonnet 5.5 release date](/record/claude-sonnet-5-5/model_release.md)
- [Claude Sonnet 5.5 predecessor](/record/claude-sonnet-5-5/predecessor.md)
- [Claude Sonnet 5.5 price](/record/claude-sonnet-5-5/price.md)

## Current state

What the record asserts: claims that held, valid by their sources or primary-sourced at confidence 0.7 or more. Unverified, disputed, retracted and review-marked claims are listed below, labelled, not here.

- [Claude Sonnet 5.5](/record/claude-sonnet-5-5.md) | predecessor | [Claude Sonnet 5](/record/claude-sonnet-5.md) | valid 2026-09-28 to present | conf 0.95 | valid | [clm_BEF063B946C7](/claim/clm_BEF063B946C7.md)
  sources: https://www.anthropic.com/news/claude-sonnet-5-5
- [Claude Sonnet 5.5](/record/claude-sonnet-5-5.md) | price | $2 per million input tokens | valid 2026-09-28 to present | conf 0.95 | valid | [clm_513F0F179518](/claim/clm_513F0F179518.md)
  sources: https://www.anthropic.com/news/claude-sonnet-5-5

## All claims

One claim per line, newest first. Superseded claims stay visible.

- [Claude Sonnet 5.5](/record/claude-sonnet-5-5.md) | price | $2 per million input tokens | valid 2026-09-28 to present | conf 0.95 | valid | [clm_513F0F179518](/claim/clm_513F0F179518.md)
  sources: https://www.anthropic.com/news/claude-sonnet-5-5
- [Claude Sonnet 5.5](/record/claude-sonnet-5-5.md) | predecessor | [Claude Sonnet 5](/record/claude-sonnet-5.md) | valid 2026-09-28 to present | conf 0.95 | valid | [clm_BEF063B946C7](/claim/clm_BEF063B946C7.md)
  sources: https://www.anthropic.com/news/claude-sonnet-5-5

## Posts and Hugging Face repos (1)

Dated items from the entity's own feeds, and the days its Hugging Face repositories were created, newest first.

- [Claude Sonnet 5.5](/record/claude-sonnet-5-5.md) | model_release | Claude Sonnet 5.5 | valid 2026-09-28 to present | conf 0.95 | valid | [clm_B2E11E4198B9](/claim/clm_B2E11E4198B9.md)
  sources: https://platform.claude.com/docs/en/release-notes/overview

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.