As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/claude-sonnet-4-6/

# Claude Sonnet 4.6

Anthropic, Claude 4 family. Status: legacy. Type: reasoning model. Released: 2026-02-17. Training cutoff: 2025-08.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Anthropic API (Claude API) | `claude-sonnet-4-6` | https://api.anthropic.com/v1/messages | https://platform.claude.com/docs/en/models/sonnet-4-6/overview |
| AWS Bedrock (InvokeModel) | `anthropic.claude-sonnet-4-6` |  | https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy |
| Google Cloud Vertex AI | `claude-sonnet-4-6` |  | https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai |
| Microsoft Foundry (Azure) | `claude-sonnet-4-6` |  | https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry |
| Claude Platform on AWS | `claude-sonnet-4-6` |  | https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws |
| OpenRouter | `anthropic/claude-sonnet-4.6` |  | https://openrouter.ai/anthropic/claude-sonnet-4.6 |
| Web app |  |  | https://claude.ai |

## Pricing

- Input: $3 per 1M tokens
- Output: $15 per 1M tokens
- Cache read: $0.30 per 1M tokens
- Unit as published: per 1M tokens (USD); Batch API 50% off
- Source: https://platform.claude.com/docs/en/about-claude/pricing
- Last checked: 2026-09-29

## Specs

- Input: text, image, pdf
- Output: text
- Context window: 1,000,000 tokens
- Max output: 128,000 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- Published training cutoff: 2025-08 (August 2025).
- AI events after it on Post-Cutoff: 2,002 (461 major, 87 historic), as of 2026-11-13.
- Already missing at launch: 73.
- Briefings of the news since August 2025: https://postcutoff.com/briefings/cutoff-2025-08-s.md (short), https://postcutoff.com/briefings/cutoff-2025-08-m.md (medium), https://postcutoff.com/briefings/cutoff-2025-08.md (full).
- Its card, with five things it has never heard of: https://postcutoff.com/you/claude-sonnet-4-6/

## What stands out

- Human-level computer use on common tasks: Anthropic cites human-level performance on tasks such as navigating complex spreadsheets and multi-step web forms (OSWorld). Source: https://www.anthropic.com/news/claude-sonnet-4-6
- Beats previous Opus in user preference: Users preferred it to Opus 4.5 59% of the time on coding, citing less overengineering. Source: https://www.anthropic.com/news/claude-sonnet-4-6
- 1M context for Sonnet 4.6: 1M-token context window (beta at launch). Source: https://www.anthropic.com/news/claude-sonnet-4-6

## Notes

Last model on the older tokenizer. Adaptive thinking (budget_tokens deprecated). Training data cutoff Jan 2026. Bedrock via InvokeModel. Retirement not sooner than 2027-02-17.

Legacy Sonnet; migrate to `claude-sonnet-5-5`.

```bash
curl https://api.anthropic.com/v1/messages \
 -H "x-api-key: $ANTHROPIC_API_KEY" -H "anthropic-version: 2023-06-01" -H "content-type: application/json" \
 -d '{"model":"claude-sonnet-4-6","max_tokens":16000,"messages":[{"role":"user","content":"Hello"}]}'
```

Sources:
- Model page: https://platform.claude.com/docs/en/models/sonnet-4-6/overview
- Announcement: https://www.anthropic.com/news/claude-sonnet-4-6
- Pricing: https://platform.claude.com/docs/en/about-claude/pricing
- Models overview: https://platform.claude.com/docs/en/about-claude/models/overview
- Deprecations: https://platform.claude.com/docs/en/about-claude/model-deprecations

Model page: https://postcutoff.com/m/claude-sonnet-4-6/