OpenRouterClaude Opus 5 (Fast) model ID, context window & pricing
claude-opus
Quick facts
Model ID anthropic/claude-opus-5-fast
Source OpenRouter
Context Window 1000000
Pricing $10.00 input / $50.00 output per 1M tokens
Capabilities tool calling, reasoning, structured output
Model overview
Claude Opus 5 (Fast) is an AI model from OpenRouter with 1000000 token context window and text, image, pdf input support.
Published pricing is $10.00 input and $50.00 output per 1M tokens.
- Workloads that use text, image, pdf inputs with text outputs.
- Agent and tool workflows that need function calling.
- Reasoning-heavy prompts where stepwise problem solving matters.
Model ID anthropic/claude-opus-5-fast
Provider OpenRouter
Family claude-opus
Status -
Knowledge Cutoff 2026-05
Release Date 2026-07-24
Input Modalities text, image, pdf
Output Modalities text
Context Window 1000000
Input Limit -
Output Limit 128000
Tool Calling Yes
Reasoning Yes
Structured Output Yes
Temperature Control No
Open Weights No
Input Cost / 1M tokens $10.00
Output Cost / 1M tokens $50.00
Reasoning Cost / 1M tokens -
Cache Read Cost / 1M tokens $1.00
Cache Write Cost / 1M tokens $12.50