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Claude Sonnet 5.5 anthropic
Release timeline
Stages observed by the nightly radar: announced → API only → weights public → served by third parties. Each entry carries the source it was seen at.
- 2026-09-28 · API only source seeded from the earliest dated observation when first seen · observed 2026-10-07 20:20 UTC
- next · Next expected: additional third-party providers (closed weights; none expected on Hugging Face)
Description
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...
via OpenRouter listing · observed 2026-10-24 21:26 UTC. The listing text is the provider's own description, not an assessment.
Where to run 6 providers · 9 endpoints
Hosted endpoints observed for Claude Sonnet 5.5, sorted by input price (USD per million tokens). Each row names its observer and date; prices change daily, so check the source before quoting. Cheapest observed input price: $2.00/M.
| Provider | Model ref | Context | Quant | $/M in | $/M out | tok/s | TTFT | Tools | Status | Observed |
|---|---|---|---|---|---|---|---|---|---|---|
| Amazon Bedrock openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.00 | $10.00 | — | — | yes | live | 2026-10-24 |
| Anthropic openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.00 | $10.00 | — | — | yes | live | 2026-10-24 |
| Azure openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.00 | $10.00 | — | — | yes | live | 2026-10-24 |
| Claude Platform on AWS openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.00 | $10.00 | — | — | yes | live | 2026-10-24 |
| DeepInfra deepinfra | anthropic/claude-sonnet-5-5 | 977K | — | $2.00 | $10.00 | — | — | — | live | 2026-10-24 |
| Google openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.00 | $10.00 | — | — | yes | live | 2026-10-24 |
| Azure openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.20 | $11.00 | — | — | yes | live | 2026-10-24 |
| Google openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.20 | $11.00 | — | — | yes | live | 2026-10-24 |
| Google openrouter | anthropic/claude-sonnet-5.5 | 977K | unknown | $2.20 | $11.00 | — | — | yes | live | 2026-10-24 |
Third-party providers observed: 1 (DeepInfra). Cache-read price $0.10/M (source, observed 2026-10-24).
Facts
| Context length | 1,000,000 tokens (977K) · OpenRouter listing |
|---|---|
| Modalities | text + image + file → text |
| Max completion tokens | 128,000 |
| Supported parameters | include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, stop, structured_outputs, tool_choice, tools, verbosity |
| Openness | Closed weights · closed lab |
| Stage | API only |
| Confidence | medium |
| Pricing (USD per M tokens) |
in $2.00 · out $10.00 · cache read $0.10 OpenRouter list price (cheapest live endpoint) · source · observed 2026-10-24 21:26 UTC |
Open alternatives 5
Nearest open-weights models by modality, context and price on this watch list. Not a quality ranking.
| Model | Org | Params | Context | $/M in | License | Why it is here |
|---|---|---|---|---|---|---|
| Kimi-K3 | moonshotai | 2.78T | 1M | $0.23 | other | similar context (1.05M), cheaper input price ($0.2261/M vs $2/M), vision input |
| MiniMax-M3 | MiniMaxAI | 427B | 1M | $0.22 | other | similar context (1.05M), cheaper input price ($0.224/M vs $2/M), vision input |
| Qwen3.5-4B | Qwen | 4.66B | 256K | — | apache-2.0 | vision input |
| DeepSeek-V4.1-Flash-1017 | deepseek-ai | 763B | 1M | $0.20 | mit | similar context (1.05M), cheaper input price ($0.2/M vs $2/M), vision input |
| Llama-3.2-11B-Vision-Instruct | meta-llama | 10.7B | — | — | llama3.2 | vision input |
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Watch the release radar
- /feeds/upcoming.xml(RSS 2.0) · upcoming and just-released models, one item per entry
- /feeds/upcoming.json(JSON Feed 1.1) · same, JSON Feed 1.1
Email alerts are not open yet; the feeds above are the same data. See feeds for the item schema.
Sources
- openrouter anthropic/claude-sonnet-5.5 · observed 2026-10-24 21:26 UTC
- deepinfra anthropic/claude-sonnet-5-5 · observed 2026-10-24 21:26 UTC
Radar run: 2026-10-25 06:51 UTC · Last verified 2026-10-25 06:51 UTC