Claude Sonnet 5Latest
The best combination of speed and intelligence
- Context window
- 1Mtokens
- Max output
- 128Ktokens
- Input pricing
- $2/ MTok
- Output pricing
- $10/ MTok
Overview
Claude Sonnet 5 is the next generation of Anthropic's Sonnet model family. It is a drop-in upgrade for Claude Sonnet 4.6 with three behavior changes: adaptive thinking is on by default, manual extended thinking now returns a 400 error (it was deprecated on Claude Sonnet 4.6), and setting sampling parameters (temperature, top_p, top_k) to non-default values returns a 400 error. This page summarizes everything new at launch, including a new tokenizer.
How it compares
| Model | Context | Max output | Price / MTok | Latency | Thinking | Default effort | Knowledge cutoff |
|---|---|---|---|---|---|---|---|
| Claude Fable 5.1 | 1M | 128K | $10 / $50 | Slower | Adaptive (always on) | high | Jun 2026 |
| Claude Opus 5 | 1M | 128K | $5 / $25 | Moderate | Adaptive | high | May 2026 |
| Claude Sonnet 5This model | 1M | 128K | $2 / $10 | Fast | Adaptive | high | Jan 2026 |
| Claude Haiku 4.5 | 200K | 64K | $1 / $5 | Fastest | Extended | — | Feb 2025 |
Specifications
Model IDs
- Claude API
Pricing
- Input
- $2 / MTok
- Output
- $10 / MTok
- 5m cache write
- $2.50 / MTok
- 1h cache write
- $4 / MTok
- Cache read
- $0.20 / MTok
- Batch API
- 50% discount on input and output
- Full price list
- Pricing
Capabilities
- Context window
- 1M tokens
- Max output
- 128K tokens
- Max output (Batch API, beta)
- 300K tokens
- Thinking
- Adaptive
- Default effort
high- Comparative latency
- Fast
- Input → output
- Text and images → text
- Reliable knowledge cutoff
- Jan 2026
- Training data cutoff
- Jan 2026
Availability
- Status
- Active (latest)
- Released
- June 30, 2026
- Retirement
- Not sooner than June 30, 2027
- Platforms
- Claude APIAmazon BedrockGoogle CloudMicrosoft FoundryClaude Platform on AWS
Good to know
- On the Message Batches API, Claude Sonnet 5 supports up to 300k output tokens with the
output-300k-2026-03-24beta header. - Setting
temperature,top_p, ortop_kto non-default values returns a 400 error. See What's new in Claude Sonnet 5. - Query limits and capabilities programmatically with the Models API.
Resources
Model-specific prompting guidance.
On by default on Claude Sonnet 5. Steer depth with effort.
Effort defaults to high on the Claude API and Claude Code. Choose a level per workload.
1M tokens by default. How the window is counted and managed.
Reference
Safety evaluations and deployment decisions for Claude Sonnet 5.
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.
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