Claude Opus 5.5Latest
For long-running agentic coding and knowledge work
- Context window
- 1Mtokens
- Max output
- 128Ktokens
- Input pricing
- $4/ MTok
- Output pricing
- $20/ MTok
Overview
Claude Opus 5.5 is built for long-running agentic coding and knowledge work. Typical uses include multihour autonomous coding agents, large-scale refactoring, complex systems engineering, vision-heavy workflows, and computer use.
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 5.5This model | 1M | 128K | $4 / $20 | Moderate | Adaptive (always on) | medium | Jun 2026 |
| Claude Sonnet 5.5 | 1M | 128K | $2 / $10 | Fast | Adaptive | high | Jun 2026 |
| Claude Haiku 5.5 | 1M | 128K | From $0.10 / $0.50 | Fastest | Adaptive | medium | Jun 2026 |
Specifications
Model IDs
Pricing
- Input
- $4 / MTok
- Output
- $20 / MTok
- 5m cache write
- $5 / MTok
- 1h cache write
- $8 / MTok
- Cache read
- $0.20 / 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 (always on)
- Default effort
medium- Comparative latency
- Moderate
- Input → output
- Text and images → text
- Reliable knowledge cutoff
- Jun 2026
- Training data cutoff
- Jun 2026
Availability
- Status
- Active (latest)
- Released
- September 22, 2026
- Retirement
- Not sooner than September 22, 2027
Good to know
- Adaptive thinking is always on and can’t be turned off. Control thinking depth with the effort parameter.
- On the Message Batches API, Claude Opus 5.5 supports up to 300k output tokens with the
output-300k-2026-03-24beta header. - The minimum cacheable prompt length is 512 tokens. See Prompt caching.
- Query limits and capabilities programmatically with the Models APIPreview with links to the API reference available — press Tab until focus enters the card, Escape to return..
Resources
Behavioral differences and prompting patterns specific to Claude Opus 5.5.
The control for thinking depth, latency, and cost. Choose a level for each workload.
How adaptive thinking works and how thinking blocks are preserved.
Lower-latency Claude Opus 5.5 on the Claude API, priced separately.
Reference
The system prompt Claude Opus 5.5 uses on claude.ai and the Claude apps.
Safety evaluations and deployment decisions for Claude Opus 5.5.
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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