Claude Sonnet 5.5
by AnthropicChatretires not before 2027-09-28
Fast Claude model for everyday coding, agents, and knowledge work
- Context
- 1M tokens
- Max output
- 128,000 tokens
- Released
- 2026-09-28
- Weights
- Closed
anthropic/claude-sonnet-5-5 · also seen as duo-chat-sonnet-5-5, eu.anthropic.claude-sonnet-5-5, us.anthropic.claude-sonnet-5-5, global.anthropic.claude-sonnet-5-5, +16 more
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-09-28
- Weights
- Closed
- Input
- Text, Image, PDF
- Output
- Text
- Context window
- 1,000,000 max across endpoints
- Max output
- 128,000
- Providers
- 18 + 19 gateways, not counted as providers
- Epoch Capabilities Index
- 164.5 ± 3.5 against price
- Direct price range
- $2.00–$2.60 in · $10–$13 out per 1M tokens · across all 18 providers
More details
- Last updated
- 2026-09-28
- Knowledge cutoff
- 2026-06
- Developer country
- United States of America
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel tools
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web search
- Computer use
- System messagesunknown
- Assistant prefill
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $2.00 in / $10 out per 1M tokens at Anthropic on every data refresh since then.
Tracked from 19 Oct 2026, the earliest refresh this model's headline price can be rebuilt from. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs Claude Sonnet 5.5 |
|---|---|---|---|---|---|
| Abliterated Model LargeAbliteration | $3.33 | $3.00 | $5.00 | 1M | +0% |
| Abliterated Model Large V2Abliteration | $3.33 | $3.00 | $5.00 | 1M | +0% |
| Claude Sonnet LatestAnthropic | $3.33 | $2.00 | $10 | 1M | +0% |
| Gemini 4 ArgonGoogle | $3.33 | $2.00 | $10 | 1.05M | +0% |
| GPT-6.1 SolOpenAI | $3.33 | $2.00 | $10 | 1.05M | +0% |
| GPT-6.1 Sol ProOpenAI | $3.33 | $2.00 | $10 | 1.05M | +0% |
| GPT-6 SolOpenAI | $3.33 | $2.00 | $10 | 1.05M | +0% |
| GPT-6 Sol ProOpenAI | $3.33 | $2.00 | $10 | 1.05M | +0% |
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