Free Claude Opus 5 API
Updated 7/25/2026
Anthropic's Opus 5: near-Fable coding/agent performance at half Fable list price ($5/$25), 1M context.
About the Model
Why Claude Opus 5?
Anthropic's 2026-07-24 Opus upgrade: near Claude Fable 5 intelligence at half Fable's list price (same $5 / $25 per MTok as Opus 4.8). A strong default for long-horizon coding and knowledge work.
Strengths
- Same sticker, higher unit output on official task-cost curves (Frontier-Bench, CursorBench, OSWorld, etc.).
- Stronger self-check / iteration for multi-file and end-to-end agent tasks.
- 1M context + 128k max output.
- Optional Fast mode (~2.5× speed, 2× price).
Free basis (this directory)
Via Vercel AI Gateway: unpaid teams typically get ~$5 credits / 30 days usable on anthropic/claude-opus-5 when free-tier eligible. Enough for smoke tests, not unlimited agents. Strict rate limits — not for production.
Scope
Multilingual text + image input, tool use, agentic coding. Default on Claude Max; strongest model on Claude Pro.
Deep dive: MuiRouter.
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