Claude Opus 5 API pricing, context and limits

Q: What is the exact API model identifier?

Use claude-opus-5 exactly as shown in the provider model reference. Display names are not interchangeable with API identifiers.

Anthropic · Active

Claude Opus 5

claude-opus-5

Context window: 1,000,000 tokens
Maximum output: 128,000 tokens
Input price: $5 per 1M tokens
Output price: $25 per 1M tokens
Modalities: text, image

Last verified 12 Sep 2026 · Source ↗

Official description

Claude Opus 5 For complex agentic coding and enterprise work

Read the official model reference ↗.

Where this model fits

claude-opus-5 is part of the Anthropic API catalog. Its documented modalities are text, image. Choose it against the request format, output requirements and operational limits of your application.

The source metadata identifies support for coding. Confirm endpoint-specific parameters in the official reference before integrating that capability.

The source metadata identifies support for reasoning. Confirm endpoint-specific parameters in the official reference before integrating that capability.

For a repeatable evaluation, use representative requests, inspect structured output or tool calls, and log latency and usage in your own account. Catalog metadata establishes compatibility; it does not measure answer quality on your workload. Start from the provider guide for authentication and endpoint setup.

Current pricing

Verified model prices
Model	Price type	USD	Unit	Tier	Region	Source
Claude Opus 5	Cached Input	$0.5	per 1M tokens	Standard	See source	Official source ↗
Claude Opus 5	Input	$5	per 1M tokens	Standard	See source	Official source ↗
Claude Opus 5	Output	$25	per 1M tokens	Standard	See source	Official source ↗

Last verified 12 Sep 2026 · Source ↗

Estimate request, daily and monthly usage in the API cost calculator.

Rate limits and availability

Verified rate limits
Model or scope	Tier	Metric	Limit	Notes	Source
Claude Opus 5 `claude-opus-5`	published default	RPM	1,000	Input and output token limits are separate in the official table; account settings prevail.	Official source ↗

Last verified 12 Sep 2026 · Source ↗

Account-specific capacity may differ. Check the provider rate-limit guide and the free-tier conditions.

Three alternatives to compare

These alternatives share a documented modality and have the closest combination of input price and context size in the current catalog. This is a specification comparison, not a quality benchmark.

Computed model alternatives
Model	Provider	Input / 1M tokens	Context
Anthropic: Claude Fable 5 (batch)	OpenRouter	$5	1,000,000
Anthropic: Claude Fable 5.1 (batch)	OpenRouter	$5	1,000,000
Anthropic: Claude Opus 4.6	OpenRouter	$5	1,000,000

Use the exact identifier in Python

This identifier fragment belongs in the authenticated request described in the provider Python tutorial. The tutorial covers the correct SDK, endpoint, environment variable and response shape.

model = "claude-opus-5"
# Pass model to the provider-specific request in the tutorial.

Recent changes

12 September 2026

Anthropic · Claude Opus 5 — MetadataRecord updated; consult the linked source for details. → Record updated; consult the linked source for details.Source ↗
Anthropic · Claude Opus 5 — MetadataRecord updated; consult the linked source for details. → Record updated; consult the linked source for details.Source ↗
Anthropic · Claude Opus 5 — MetadataRecord updated; consult the linked source for details. → Record updated; consult the linked source for details.Source ↗
Anthropic · Claude Opus 5 — ValueNot previously recorded → Tier: published default · Metric: RPM · Value: 1000 · Notes: Input and output token limits are separate in the official table; account settings prevail.Source ↗
Anthropic · Claude Opus 5 — Amount UsdNot previously recorded → Price category: output · USD: 25 · Unit: per 1M tokensSource ↗
Anthropic · Claude Opus 5 — Amount UsdNot previously recorded → Price category: cached_input · USD: 0.5 · Unit: per 1M tokensSource ↗
Anthropic · Claude Opus 5 — Amount UsdNot previously recorded → Price category: input · USD: 5 · Unit: per 1M tokensSource ↗
Anthropic · Claude Opus 5 — MetadataRecord updated; consult the linked source for details. → SDK languages: ["Python","JavaScript","Go","Java","Ruby","PHP","C#"]Source ↗
Anthropic · Claude Opus 5 — First SeenNot previously recorded → Model: Claude Opus 5Source ↗

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Frequently asked questions

What is the exact API model identifier?

Use claude-opus-5 exactly as shown in the provider model reference. Display names are not interchangeable with API identifiers.

How much does this model cost?

The current verified prices and billing units are listed in the pricing table above. Cache, batch, tier and region conditions remain separate rows when the provider documents them.

How much input can the model accept?

The model card shows the documented context window and maximum output when available. Your request must leave room for both input and generated output, including any provider-specific reasoning allocation.

Can I use a free tier?

Check the linked provider free-tier page for eligibility and account conditions. An account credit or temporary trial does not establish a permanent free rate.

Where do these model facts come from?

Official provider references are linked beside the data and in Sources. Changes are recorded with observation times; unresolved or undocumented fields are left unavailable.

Sources

Last verified 12 Sep 2026 · Source ↗