Claude Haiku 4.5Legacy
- Context window
- 200Ktokens
- Max output
- 64Ktokens
- Input pricing
- $1/ MTok
- Output pricing
- $5/ 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 Haiku 5.5 | 1M | 128K | From $0.10 / $0.50 | Adaptive | medium | Jun 2026 |
| Claude Haiku 4.5This modelLegacy | 200K | 64K | $1 / $5 | Extended | — | Feb 2025 |
Specifications
Model IDs
- Claude API
- Claude API alias
Pricing
- Input
- $1 / MTok
- Output
- $5 / MTok
- 5m cache write
- $1.25 / MTok
- 1h cache write
- $2 / MTok
- Cache read
- $0.10 / MTok
- Batch API
- 50% discount on input and output
Capabilities
- Context window
- 200K tokens
- Max output
- 64K tokens
- Thinking
- Extended
- Default effort
- Not supported
- Input → output
- Text and images → text
- Reliable knowledge cutoff
- Feb 2025
- Training data cutoff
- Jul 2025
Availability
- Status
- Active (legacy)
- Released
- October 15, 2025
- Retirement
- Not sooner than October 15, 2026
Good to know
claude-haiku-4-5is a convenience alias that resolves to the pinned snapshotclaude-haiku-4-5-20251001. See Model IDs and versioning.- Claude Haiku 4.5 uses manual extended thinking (
thinking.type: "enabled"), not adaptive thinking. - Query limits and capabilities programmatically with the Models API.
Resources
What changes when moving from Claude Haiku 4.5 to Claude Haiku 5.5.
The current Haiku model: overview, specs, and resources.
Claude Haiku 4.5 supports manual extended thinking with budget_tokens.
When to start efficiency-first with Haiku and when to reach for a larger model.
Techniques that pair well with a fast, low-cost model.
Reference
The system prompt Claude Haiku 4.5 uses on claude.ai and the Claude apps.
Safety evaluations and deployment decisions for Claude Haiku 4.5.
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.
Claude Haiku 4.5 is also available through the InvokeModel Bedrock integration and Bedrock-style model IDs.
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