Anthropic: Claude Opus 4

anthropic/claude-opus-4 · AnthropicUnmeasurable

Declared family: Claude
Declared tokenizer tag: Claude
Entered catalogue: 22 May 2025
Measurement: Deferred: measurement cost above the per-model cap
Evidence confidence: Unknown

What we checked

Four different kinds of evidence, and what each one showed

We checked	What we found	Where it came from
How it counts tokens	Not measured yet	we measured it
How its API is set up	A combination of settings no other listing in the catalogue uses	api_ef0b5b0d
How much it can read and write	Reads up to 200,000 tokens at once, writes up to 32,000	its own listing
Whether it thinks before answering	Reasons when asked to	its own listing

Declared record

What the catalogue claims about this model

Claude Opus 4 is benchmarked as the world’s best coding model, at time of release, bringing sustained performance on complex, long-running tasks and agent workflows. It sets new benchmarks in...

Modalities: text+image+file->text
Declared tokenizer: Claude
Prompt price: $15.0 / M tokens
Completion price: $75.0 / M tokens

Supported parameters

include_reasoningmax_tokensreasoningstoptemperaturetool_choicetoolstop_p

defaults: {"temperature":null,"top_p":null,"top_k":null,"frequency_penalty":null,"presence_penalty":null,"repetition_penalty":null}

Catalogue entry

History

Every observation, kept as taken

22 May 2025Enters the OpenRouter catalogue declared as Claude.

* Anthropic: Claude Opus 4 no longer appears in the OpenRouter catalogue, first absent from the snapshot of 5 October 2026. The record stays because the measurements above were real when they were taken and this address has been published.