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Models / Anthropic

Claude Opus 5.5

GA

The current Opus: 'For long-running agentic coding and knowledge work'. Released September 22, 2026 ('Latest. Released September 22, 2026' on its model page); the deprecations table reads Active with a tentative retirement not sooner than September 22, 2027. $4 in / $20 out per MTok, a lower list price compared with Opus 5 and Opus 4.8 at $5 / $25. 5m cache write $5/MTok, 1h cache write $8/MTok; cache hits are 5% of input = $0.20/MTok (the usual multiplier is 10%). Batch $2 in / $10 out. Fast mode (research preview, first-party Claude API only) $8 in / $40 out. Adaptive thinking always on; effort defaults to medium. 1M context, 128K max output (300K on the Message Batches API with the output-300k-2026-03-24 beta header). Reliable knowledge cutoff Jun 2026; training data cutoff Jun 2026. Tool-use system prompt overhead 286 tokens. Added 2026-10-02, ten days after release: the delay is ours.

Claude Opus 5.5 by Anthropic costs $4 per 1M input tokens and $20 per 1M output tokens ($8/1M blended), with a 1M (1.000.000-token) context window. It is generally available (GA), with a knowledge cutoff of Jun 2026.

Last verified: 15 Oct 2026 · sourced from official provider documentation

Provider
Anthropic
Status
GA
Input price
$4 / 1M tokens
Output price
$20 / 1M tokens
Cached input
$0.2 / 1M tokens
Blended price
$8 / 1M tokens
Context window
1.000.000 tokens (1M)
Max output
128.000 tokens
Modality
text, image, vision
Open weights
No — API only
Knowledge cutoff
2026-06
Released
22 Sep 2026
API string
claude-opus-5-5

Source: Anthropic official documentation ↗

See also

Compare Claude Opus 5.5 head-to-head

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$8 vs $8 blended /M · cross-provider

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Claude Opus 5.5 vs DeepSeek-V4.1-Flash→

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Claude Opus 5.5 vs Grok 4.7→

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FAQ

Claude Opus 5.5 — questions & answers

How much does Claude Opus 5.5 cost?

Claude Opus 5.5 is priced at $4 per 1M input tokens and $20 per 1M output tokens ($8/1M blended at a 3:1 input-to-output ratio), with cached input at $0.2 per 1M tokens.

What is the context window of Claude Opus 5.5?

Claude Opus 5.5 has a 1.000.000-token context window (1M), with up to 128.000 output tokens per request.

Is Claude Opus 5.5 deprecated?

No — Claude Opus 5.5 is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does Claude Opus 5.5 support image or vision input?

Yes — Claude Opus 5.5 accepts image input. Listed modalities: text, image, vision.

Can I self-host Claude Opus 5.5?

No — Claude Opus 5.5 is proprietary. Its weights are not publicly released, so it is available only through Anthropic's API (or hosted partners), not for self-hosting.

What is the API model string for Claude Opus 5.5?

The API model identifier for Claude Opus 5.5 is "claude-opus-5-5" when calling Anthropic's API.

What is Claude Opus 5.5's knowledge cutoff?

Claude Opus 5.5's training knowledge cutoff is Jun 2026.