Anthropic

Claude Opus 5.5

A model for long-running coding agents and knowledge work, with a 1M-token context window, text and image input, and always-on adaptive thinking with adjustable effort. Anthropic offers Standard and Fast modes. Fast uses the same model with faster inference, delivering up to 2.5x more output tokens per second at premium pricing. Fast mode is a research preview; its speed benefit is output generation, not time to first token.

ActiveReleased September 22, 2026Knowledge cutoff June 30, 2026Available from 3 providers
Tool callingCan invoke external tools and APIs (function calling) mid-response.Structured outputCan return JSON or schema-constrained responses instead of free text.ReasoningUses extended thinking / chain-of-thought for harder multi-step problems.Effort controlLets you dial thinking depth (low / medium / high) to trade cost for quality.Fine-tuningSupports training a custom variant on your own data (vendor fine-tune API or self-hosted open weights).

Source: Model specifications; June 2026 cutoff represented as month end, Tool calling, structured outputs, and fast mode, 512-token minimum; default 5-minute and optional 1-hour caching, Claude API does not offer fine-tuning, Thinking token billing and direct-provider rates

Price per 1M tokens
$4 in / $20 out
Context window1,000,000
Max output128,000
Cache read$0.2 / M
Min cache prefix512 tokens
Cache lifetime5 min
Batch discount-50%
Input
  • Text
  • Image
Output
  • Text
Priced across3 providers

Pricing

Every billing leg from the live catalog, in USD per 1M tokens.

Billing legRateBatch
Input$4 / M$2 / M
Output$20 / M$10 / M
Cache read$0.2 / M$0.1 / M
Cache write · 5 min$5 / M$2.5 / M
Cache write · 1 hour$8 / M$4 / M

Cost calculator

Billing-grade math over the rate card above, including the thinking tokens most estimates miss.

Hidden reasoning tokens bill as output. 1.0x = thinking off. Medium-effort reasoning typically lands near 3x; heavy reasoning runs 6x to 8x. Set it to match your workload.

Estimated monthly cost
$2.0K
at current list prices
Fresh input$800
Cached input$0.00
Output incl. thinking$1.2K
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Compare providers

The same model, priced across every platform that serves it. Lowest combined in/out rate is flagged.

PlatformInput / MOutput / MCache read / MBatchAccess
Anthropic · StandardLowest
$4$20$0.2✓First-party API
Cursor
$4$20$0.2-Direct
Anthropic · Fast
$8$40$0.4-First-party API

Anthropic Fast mode uses the same model with faster output generation at premium pricing. It is a research preview and does not support batch requests. Fast mode details

Price history

Has this model gotten cheaper or more expensive?

No changePriced at $4 / $20 per 1M since September 23, 2026.

More from Anthropic

Other models from the same provider.

Claude Fable 5.1
anthropic/claude-fable-5-1
$10 / $50 in / out per 1M
Claude Opus 5
anthropic/claude-opus-5
$5 / $25 in / out per 1M
Claude Sonnet 5
anthropic/claude-sonnet-5
$2 / $10 in / out per 1M
Claude Fable 5
anthropic/claude-fable-5
$10 / $50 in / out per 1M
Claude Opus 4.8
anthropic/claude-opus-4-8
$5 / $25 in / out per 1M
Claude Haiku 4.5
anthropic/claude-haiku-4-5
$1 / $5 in / out per 1M

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Rates are generated from SuperPenguin's live pricing catalog.