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AnthropicModel

Claude Opus 5.5

Claude Opus 5.5 is a hosted Anthropic model for long-running agentic coding and knowledge work, released with a 1,000,000-token default context window and 128k max output tokens. It enforces always-on adaptive thinking and is deployed across multiple cloud platforms and the Claude API with migration guidance for tool and computer toolset changes.

What it does

Use it for long-running agentic coding and knowledge work.

Availability
Claude API, Claude in Amazon Bedrock, Claude Platform on AWS, Claude on Google Cloud, and Claude in Microsoft Foundry
Pricing model
$4 / $20 USD per MTok
Deployment
Claude API and named cloud services
Privacy
Not established
Licence
Not established
Capability
code generationagentsanalysis
Modality
textcode
Access
API
Deployment
hosted
Pricing
usage-based
Target user
developerenterpriseresearcher

Evidence

10 claims
  • Fast mode for Claude Opus 5.5 is out of research preview, and access no longer needs to be requested. [1]
    Fast mode is out of research preview for Claude Opus 5.5, and you no longer need to request access.
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • Requests to Claude Opus 5.5 no longer require the fast-mode-2026-02-01 beta header. [1]
    Requests to Claude Opus 5.5 no longer require the fast-mode-2026-02-01 beta header, and requests that still send it keep working.
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • Claude Opus 5.5 fast mode has a default rate limit in every usage tier. [1]
    Claude Opus 5.5 now has a default fast mode rate limit in every usage tier.
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • Fast mode is available on Claude in Microsoft Foundry for deployments hosted on Azure. [1]
    Fast mode for Claude Opus 5.5 is now available on Claude in Microsoft Foundry for deployments hosted on Azure.
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • Claude Opus 5.5 is for long-running agentic coding and knowledge work. [2] [3] [4] [5] [6]
    We’ve launched Claude Opus 5.5 ( claude-opus-5-5 ), a model for long-running agentic coding and knowledge work.
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • It has a 1M token context window by default. [2]
    It has a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking , at $4 / $20 USD per MTok (Claude Opus 5 is $5 / $25 USD).
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • It supports up to 128k output tokens. [2]
    It has a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking , at $4 / $20 USD per MTok (Claude Opus 5 is $5 / $25 USD).
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • Adaptive thinking is always on. [2] [3] [6] [7]
    It has a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking , at $4 / $20 USD per MTok (Claude Opus 5 is $5 / $25 USD).
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • It is available on the Claude API, Claude in Amazon Bedrock, Claude Platform on AWS, Claude on Google Cloud, and Claude in Microsoft Foundry. [2]
    Claude Opus 5.5 is available on the Claude API, Claude in Amazon Bedrock , Claude Platform on AWS , Claude on Google Cloud , and Claude in Microsoft Foundry .
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.
  • It costs $4 / $20 USD per MTok. [2]
    It has a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking , at $4 / $20 USD per MTok (Claude Opus 5 is $5 / $25 USD).
    Anthropic. Quoted text is outside CC BY 4.0 and keeps its original rights.

Sources

7
1
AnthropicOwner-controlled
https://docs.claude.com/en/release-notes/overview#2026-10-15 Retrieved 2026-10-15 22:33 UTC
Verified
2
AnthropicOwner-controlled
https://docs.claude.com/en/release-notes/overview#2026-09-22 Retrieved 2026-10-29 01:10 UTC
Verified
3
AWSReputable independent
https://aws.amazon.com/about-aws/whats-new/2026/09/claude-opus-5-5-aws/ Retrieved 2026-10-29 01:10 UTC
Verified
4
AWSReputable independent
https://aws.amazon.com/about-aws/whats-new/2026/09/claude-opus-5-5-aws-govcloud/ Retrieved 2026-10-29 01:10 UTC
Verified
6
AWSReputable independent
https://aws.amazon.com/blogs/machine-learning/claude-opus-5-5-is-now-available-on-aws/ Retrieved 2026-10-29 01:10 UTC
Verified
7
AWSReputable independent
https://aws.amazon.com/about-aws/whats-new/2026/06/kiro-claude-5-5-aws-govcloud-us/ Retrieved 2026-10-29 01:10 UTC
Verified

Versions

6
VersionEffectiveChangeChanged fieldsState
62026-10-29 01:10 UTCmaterial changeavailability, deploymentCurrent
52026-10-24 00:55 UTCmaterial changecapability, modality, access, pricing, availability, pricing model, deploymentCurrent
42026-10-22 00:16 UTCevidence updatescoreCurrent
32026-10-15 22:34 UTCmajor releasepricing, capability, deployment, availability, releaseCurrent
22026-10-01 06:48 UTCevidence updatepricing offersCurrent
12026-09-23 17:22 UTCpublicationNoneCurrent

In briefs

4

Open in the catalog

Original catalog content is licensed under CC BY 4.0, attributed to wowsuchai. Source quotations and linked content keep their original rights.