Identity
- Status
- active
- Developer ID
claude-opus-5-5- Released
- Sep 22, 2026
- Version
- Claude Opus 5.5
- License
- Unknown
AnthropicClaude Opus 5.5
Claude Opus 5.5 is Anthropic's model for long-running agentic coding and knowledge work, with always-on adaptive thinking.
- Token context
- 1,000K tokens
- Inputs
- Text, Image
- Outputs
- Text
- Released
- Sep 22, 2026
Providers & Pricing
Estimate workload cost →| Provider | Input / 1M | Output / 1M | Cache read / 1M | Cache write / 1M | Observed | Evidence |
|---|---|---|---|---|---|---|
AnthropicAvailable | $4.00 | $20.00 | $0.20 | $5.00 | Sep 22, 2026 | Provider-reported |
At a Glance
Model Facts
Capacity
- Token context
- 1,000K tokens
- Maximum output
- 128K tokens
- Total parameters
- Unknown
- Active parameters
- Unknown
- Knowledge cutoff
- Jun 1, 2026
Interface and Access
- Inputs
- Text, Image
- Outputs
- Text
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- Reasoning
- Yes
- Vision
- Yes
- Tool calling
- Yes
- Capabilities
- chat, generation, reasoning, tools
Technical Specifications
- Thinking
- Adaptive (always on)
- Default effort
- medium
- Message Batches max output (beta)
- 300000 tokens
- Retirement commitment
- Not sooner than September 22, 2027
This page represents one developer model product. Dated API snapshots, serving endpoints, pricing, regions, quantizations, and service tiers attach as versioned aliases or provider details and never create duplicate public model records.
Version Lineage
PredecessorUnknown
SuccessorsUnknown
Aliasesclaude-opus-5-5, Claude Opus 5.5
Explicit Unknowns
- Architecture
- Tokenizer
Primary Evidence
Sources and Observation Date
Comparable Peers
Related Model Comparisons
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|---|---|---|---|
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Claude Opus 5.5Anthropic | vs |  Nova 2 LiteAmazon | cross-developer peersimage, text |
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Claude Opus 5.5Anthropic | vs |  ERNIE 5.1Baidu | cross-developer peerstext |
Claude Opus 5.5Anthropic | vs | cross-developer peerstext | |
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Claude Opus 5.5Anthropic | vs |  Phi-4 ReasoningMicrosoft | cross-developer peerstext |
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Claude Opus 5.5Anthropic | vs |  Sonar ProPerplexity | cross-developer peerstext |
Questions
Claude Opus 5.5 FAQs
What is Claude Opus 5.5?+
Claude Opus 5.5 is Anthropic's model for long-running agentic coding and knowledge work, with always-on adaptive thinking. It is developed by Anthropic and its current sourced lifecycle status is active.
What inputs and outputs does Claude Opus 5.5 support?+
Claude Opus 5.5's current record lists Text and Image as input and Text as output.
How much context does Claude Opus 5.5 support?+
The current record lists a 1,000K-token context window and a maximum output of 128K tokens.
What technical specifications are published for Claude Opus 5.5?+
Claude Opus 5.5's developer-published specifications include thinking: Adaptive (always on); default effort: medium; message batches max output (beta): 300000 tokens; retirement commitment: Not sooner than September 22, 2027.
Is Claude Opus 5.5 available through an API?+
Claude Opus 5.5 is marked as API-available. The directly sourced provider records currently include Anthropic.
What capabilities and tasks does Claude Opus 5.5 support?+
Claude Opus 5.5's recorded capabilities are chat, generation, reasoning, and tools. Its supported tasks are image and text.
How much does Claude Opus 5.5 cost through an API?+
The lowest directly sourced prices currently attached to Claude Opus 5.5 are $4.00 per million input tokens through Anthropic and $20.00 per million output tokens through Anthropic. Prices are provider-specific and should be checked against each cited observation date.
Can Claude Opus 5.5 be self-hosted?+
Claude Opus 5.5 is not marked as an open-weight model. Self-hosting is marked as unsupported, with no license recorded.
Does Claude Opus 5.5 have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are claude-opus-5-5 and Claude Opus 5.5.
Which models can Claude Opus 5.5 be compared with?+
The current compatible peer set includes Claude Opus 5, GPT-6 Astra, Claude Fable 5.1, Gemini 3.1 Pro, and DeepSeek V4.1 Flash. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →