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Models/Anthropic

Claude Opus 5 (Fast)

Fast-mode variant of [Opus 5](/anthropic/claude-opus-5) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

Source-linked Weight access not listed
API data Report
Input modalitiesT
Output modalitiesT
Input price$10/1M tokens
Output price$50/1M tokens
Context window1M
Max output128K
Overview

Capabilities and specifications

? Reasoning Unknown
? Tool calling Unknown
? Structured output Unknown
? Attachments Unknown
✓ Vision input Yes
? Open weights Unknown
Creator
Anthropic
Model family
Not documented
Knowledge cutoff
Not documented
License
Not documented
Release date
Not documented
Model ID
anthropic/claude-opus-5-fast
Inference availability

Provider pricing and availability

Provider-specific identifiers, limits, and prices per million tokens.

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Serving quality

Performance and reliability

Observed serving measurements stay separate from model specifications and are never estimated from price or model size.

Throughput Not reported

Generation speed; higher is faster.

Latency / TTFT Not reported

Time until the first output token arrives.

Uptime Not reported

Successful requests over a measured period.

Performance varies by inference provider, region, and load. Provider-level measurements appear only when a source reports them.

Published evaluations

Benchmarks

Raw results remain attached to their original source and version.

Benchmark registry
No comparable benchmark results

ModelBench does not infer quality from price, context size, or model name.

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Catalog activity

Recent record changes

Detected changes from successful source imports.

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No recent changes detected

This record has not changed in the retained import history.

Public API

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API documentation
Endpoint
GET https://modelbench.lol/api/v1/models/anthropic/claude-opus-5-fast
curl
curl "https://modelbench.lol/api/v1/models/anthropic/claude-opus-5-fast"