anthropic/claude-opus-5-fast idClaude Opus 5 is the latest model in Anthropic's Opus family and a step-change improvement over Opus 4.8. It delivers major gains over Opus 4.8 in agentic coding, professional knowledge work, and long-horizon reasoning, and it is stronger per token across effort levels.
# Drop-in OpenAI-compatible client$ import { generateText } from 'ai'$$ const { text } = await generateText({$ model: 'anthropic/claude-opus-5-fast',$ baseURL: 'https://synapse.garden/api/v1',$ apiKey: process.env.MG_KEY,$ prompt: 'Why is the sky blue?',$ })
| Rate | Per million tokens · USD |
|---|---|
| Input | $11.00/M |
| Output | $55.00/M |
| Cache read | $1.10/M |
| Cache write | $13.75/M |
Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘anthropic/claude-opus-5-fast’ and supply your Synapse Garden API key. No code changes beyond the base URL.
Input: $11.00/M per million tokens. Output: $55.00/M per million tokens. The free tier includes a million tokens every month at no cost.
claude-opus-5-fast supports a context window of 1M tokens, with a maximum output of 128K tokens.
No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.
Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.