Anthropic: Claude Opus 4 (20250514)
Claude Opus 4 (20250514) is a reasoning model from Anthropic released on May 22, 2025. It reads text, images and files and writes text, with a 200K token context window and up to 32K tokens per reply.
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It costs $15 per million input tokens and $75 per million output tokens. Cached input bills at $1.50, 90% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
- Modalities
- In / out price
- $15 / $75 per 1M
- Context
- 200K
- Max output
- 32K
- Released
- May 22, 2025
- Knowledge cutoff
- Mar 2025
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Claude Opus 4 (20250514) pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $15 / 1M tokens | |
|---|---|---|
| Output | $75 / 1M tokens | |
| Cached input (read) | $1.50 / 1M tokens | 90% off input |
| Cache write | $18.75 / 1M tokens |
What Claude Opus 4 (20250514) costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Claude Opus 4 (20250514) through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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Claude Opus 4 (20250514) questions
How much does the Claude Opus 4 (20250514) API cost?
$15 per million input tokens and $75 per million output tokens, with cached input at $1.50. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Claude Opus 4 (20250514)?
200,000 tokens of input, and it can write up to 32,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does Claude Opus 4 (20250514) support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Claude Opus 4 (20250514) open source?
No. Anthropic serves it through an API only, so you cannot download the weights or host it yourself.
When was Claude Opus 4 (20250514) released?
May 22, 2025, with training data up to Mar 2025.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on Claude Opus 4 (20250514)?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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