Although Claude Sonnet 4.6 is still available, you should consider migrating to Claude Sonnet 5.5.
See Claude Sonnet 5.5Models & pricingLegacy models
Claude Sonnet 4.6Legacy
- Context window
- 1Mtokens
- Max output
- 128Ktokens
- Input pricing
- $3/ MTok
- Output pricing
- $15/ MTok
How it compares to the current lineup
| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
|---|---|---|---|---|---|---|
| Claude Fable 5.1 | 1M | 128K | $10 / $50 | Adaptive (always on) | high | Jun 2026 |
| Claude Opus 5.5 | 1M | 128K | $4 / $20 | Adaptive (always on) | medium | Jun 2026 |
| Claude Sonnet 5.5 | 1M | 128K | $2 / $10 | Adaptive | high | Jun 2026 |
| Claude Sonnet 4.6This modelLegacy | 1M | 128K | $3 / $15 | Adaptive (extended deprecated) | high | Aug 2025 |
| Claude Haiku 5.5 | 1M | 128K | From $0.10 / $0.50 | Adaptive | medium | Jun 2026 |
Specifications
Model IDs
Pricing
- Input
- $3 / MTok
- Output
- $15 / MTok
- 5m cache write
- $3.75 / MTok
- 1h cache write
- $6 / MTok
- Cache read
- $0.30 / MTok
- Batch API
- 50% discount on input and output
Capabilities
- Context window
- 1M tokens
- Max output
- 128K tokens
- Max output (Batch API, beta)
- 300K tokens
- Thinking
- Adaptive (extended deprecated)
- Default effort
high- Input → output
- Text and images → text
- Reliable knowledge cutoff
- Aug 2025
- Training data cutoff
- Jan 2026
Availability
- Status
- Active (legacy)
- Released
- February 17, 2026
- Retirement
- Not sooner than February 17, 2027
Resources
What changes when moving from Claude Sonnet 4.6 to Claude Sonnet 5.5.
The current Sonnet model: overview, specs, and resources.
Reference
The system prompt Claude Sonnet 4.6 uses on claude.ai and the Claude apps.
Safety evaluations and deployment decisions for Claude Sonnet 4.6.
Full price list, including batch discounts and prompt caching rates.
How model IDs, aliases, and pinned snapshots work.
Lifecycle status and retirement commitments for every Claude model.
Claude Sonnet 4.6 uses the InvokeModel Bedrock integration and Bedrock-style model IDs.
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