Claude Platform Docs

Although Claude Opus 5 is still available, you should consider migrating to Claude Opus 5.5.

See Claude Opus 5.5

Models & pricingLegacy models

Claude Opus 5Legacy

Migrate to Claude Opus 5.5

Context window: 1Mtokens
Max output: 128Ktokens
Input pricing: $5/ MTok
Output pricing: $25/ 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 Opus 5This modelLegacy	1M	128K	$5 / $25	Adaptive	`high`	May 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

Specifications

Model IDs

Claude API
Amazon Bedrock
Claude Models on Google Cloud (Google managed)
Microsoft Foundry
Claude Platform on AWS
Claude Models on Google Cloud (Anthropic managed)

Pricing

Input: $5 / MTok
Output: $25 / MTok
5m cache write: $6.25 / MTok
1h cache write: $10 / MTok
Cache read: $0.50 / MTok
Batch API: 50% discount on input and output

Full price list

Capabilities

Context window: 1M tokens
Max output: 128K tokens
Max output (Batch API, beta): 300K tokens
Thinking: Adaptive
Default effort: high
Input → output: Text and images → text
Reliable knowledge cutoff: May 2026
Training data cutoff: May 2026

Availability

Status: Active (legacy)
Released: July 24, 2026
Retirement: Not sooner than July 24, 2027
Platforms: Claude APIAmazon Bedrock Claude Models on Google Cloud (Google managed)Microsoft Foundry Claude Platform on AWS Claude Models on Google Cloud (Anthropic managed)

Good to know

On the Message Batches API, Claude Opus 5 supports up to 300k output tokens with the output-300k-2026-03-24 beta 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

Migrate to Claude Opus 5.5

What changes when moving from Claude Opus 5 to Claude Opus 5.5.

Claude Opus 5.5

The current Opus model: overview, specs, and resources.

Prompting Claude Opus 5

Model-specific prompting guidance.

Reference

The system prompt Claude Opus 5 uses on claude.ai and the Claude apps.

Safety evaluations and deployment decisions for Claude Opus 5.

Full price list, including batch discounts and prompt caching rates.

Model IDs and versioning

How model IDs, aliases, and pinned snapshots work.

Model deprecations

Lifecycle status and retirement commitments for every Claude model.

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