Claude Opus 5.5
Claude Opus 5.5 is a language model from Anthropic PBC, first covered on 21 September 2026. It is available through an API. Its context window is 1M tokens.
Last updated
At a glance
- Made by
- Anthropic PBC
- Type
- Language model
- Availability
- API
- Licence
- Not stated
- Context window
- 1M tokens
- First seen
- 21 September 2026
- Official page
- www.anthropic.com/claude-opus-5-5 ↗
Taken from the coverage, not from our own testing; "not stated" means none of the reports we read gave it. Tracked 2 times (new versions or re-launches); the newest is shown. All tracked models →
5 stories about Claude Opus 5.5
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Simon Willison hosts agentic engineering meetup on 14th October
Simon Willison announced an evening event in San Francisco on Wednesday 14th October, co‑hosting with Jesse Vincent. The gathering is aimed at people building "weird and interesting things" with coding agents, offering…
1 sourceSimon Willison -
Rumors of new AI models may surface next week
The author, tk, shares rumors that “incredible new models might be released one after another by various companies next week.” He lists rumored models such as Claude Opus 5.5 (or 5.2), Kimi 3.1, Gemini 4 (Gemini 4…
1 sourcenote.com -
Anthropic releases Claude Opus 5.5 with $4 input and $20 output pricing, claiming 40% lower cost than Opus 5
Anthropic released Claude Opus 5.5 on September 22, 2026, as the first model in its new Claude 5.5 family. The model is priced at $4 per million input tokens and $20 per million output tokens, representing a 20%…
16 sources HN 49note.comdqindia.comMarkTechPostartificialanalysis.ai +8 more -
Anthropic releases Claude Opus 5.5 and OpenAI counters with cheaper GPT-6 Sol and Luna models
Anthropic released Claude Opus 5.5 on September 22, 2026, reducing input and output token prices by 20% to $4 and $20 per million tokens, with cache reads down 60% to 20 cents. Minutes later, OpenAI launched GPT-6 Sol…
22 sourcesMarkTechPostSimon Willisonepoch.ainote.com +14 more -
Anthropic releases Claude Opus 5.5 with Fable 5.1-level performance and 40% lower cost
Anthropic has released Claude Opus 5.5, the first model in its Claude 5.5 family, available on Amazon Bedrock and Claude Platform on AWS. The model delivers performance comparable to Claude Fable 5.1 on most workloads…
12 sources primary sourceAWS Machine Learning Blogdigit.intheverge.comThe Decoder +8 more
