What is Claude Opus 5.5?
Claude Opus 5.5 is a Anthropic model: Anthropic's 22 Sep 2026 Opus. API list $4 / $20 per 1M tokens, 1M context, 128K output. Text and image in, text out. No AA or Vals ledger row on this page as of 23 Sep 2026.
Models / Anthropic
Claude Opus 5.5
Claude Opus · Released 2026-09-22
Anthropic's 22 Sep 2026 Opus. API list $4 / $20 per 1M tokens, 1M context, 128K output. Text and image in, text out. No AA or Vals ledger row on this page as of 23 Sep 2026.
Current Claude Opus line for long-running coding and knowledge work on the Claude API, Claude apps, and major clouds.
Composite—
Context1M
Input / 1M$4.0
Output / 1M$20
Knowledge cutoffJun 2026
Statusflagship
Not enough families covered yet.Add more benchmark rows for Claude Opus 5.5 to see the family profile.
Editor's note
Recorded from the 22 Sep 2026 Anthropic launch page and the Claude Platform overview (1M context, 128K output, June 2026 cutoff). Vendor benchmark claims stay off the ledger. Sonnet 5.5 and Haiku 5.5 are not released. Editorial depth still needs a desk pass.Benchmark placements
Per-benchmark positions
Where Claude Opus 5.5 places on each public benchmark source that publishes a row. Rank counts every model with a latest row in the same test — not a universal quality score.
No benchmark rows yet for Claude Opus 5.5.
Family context
Strongest rows in each family
The three highest-scoring models with pages in each capability family. Where Claude Opus 5.5 shows up, it's highlighted.
Knowledge
- 191
- 291
- 391
Reasoning
- 196
- 295
- 395
Math
- 199
- 299
- 399
Coding
- 196
- 296
- 396
Agentic
- 1100
- 2100
- 3100
Long context
- 189
- 285
- 384
Tool use
- 189
- 287
- 387
Safety
- 192
- 292
- 391
Human preference
- 195
- 292
- 391
Family coverage
Best score per family
A high composite that hides a weak family is a trap. These bars surface the families where this model hasn't been publicly tested, and where it leads.
No family coverage yet.
Price vs. performance
Where Claude Opus 5.5 sits on the scatter
Hover any dot for name, score, and input price. Keyboard: tab through the top twelve, or use the ranking below.
AnthropicOpenAIMistralAlibabaDeepSeekGoogleMoonshotMetaxAIMiniMaxZhipuXiaomiOtherMeituanCohereNVIDIA
Full benchmark ledger
Every catalog benchmark for Claude Opus 5.5. Scores link to the original source; gaps mean no public row exists yet.
0 of 37 catalog benchmarks have a sourced row for Claude Opus 5.5.
Changelog
Version history
- Public on the Claude API, Claude apps, and AWS, Google Cloud, and Microsoft Azure.
Sources
Where the numbers come from
- Anthropic Claude Opus 5.5 announcement· checked 2026-09-23
- Claude Platform Opus 5.5 overview· checked 2026-09-23
Questions this model page answers
Every answer below is assembled from the dated fields on this page. Nothing is written separately for search.
What is Claude Opus 5.5 for?
Current Claude Opus line for long-running coding and knowledge work on the Claude API, Claude apps, and major clouds.
What does Claude Opus 5.5 cost?
Claude Opus 5.5 lists $4.0 input and $20 output per 1M tokens. Pricing last checked 2026-09-23.
How large is the Claude Opus 5.5 context window?
Claude Opus 5.5 publishes a 1M token context window.
What is the VerdictPal status of Claude Opus 5.5?
Claude Opus 5.5 carries Flagship status on the model atlas.
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