Where to use Claude Opus 5.5 for free
4 free ways to use Claude Opus 5.5 (Anthropic): rate limits per source, context window, tool calling and vision support.
Anthropic · 1,000k context · tool calling · vision · 2 of 4 verified · how we verify
Free sources
Verified first
| Offer | Served as | RPM | RPD | TPM | Context | Card | Resets | Status |
|---|---|---|---|---|---|---|---|---|
 Anthropic AI for Science Program | Claude Opus 5.5 | — | — | — | 1,000k | no card | — | Verified · Oct 12, 2026 |
 Claude API New User Credits | Claude Opus 5.5 | — | — | — | 1,000k | no card | — | Verified · Oct 12, 2026 |
 AgentRouter Free AI Credits | claude-opus-5-5 | — | — | — | — | no card | — | Listed · Sep 10, 2026 |
 Claude for Startups | Claude Opus 5.5 | — | — | — | 1,000k | no card | — | Re-verification in progress |
Claude Opus 5.5 is API only: its weights are not published. Why some models download and others do not (5 min)
Related
Frequently asked questions
- Where can I use Claude Opus 5.5 for free?
- 4 listed offers serve Claude Opus 5.5 free: Anthropic AI for Science Program, Claude API New User Credits, AgentRouter Free AI Credits and 1 more. Published rate limits are listed per source; a dash means the provider publishes none.
- What context window does Claude Opus 5.5 have on free tiers?
- The largest context any listed free source documents for Claude Opus 5.5 is 1,000k tokens. Some free tiers cap it lower; the per-source value is in the table.
- Does Claude Opus 5.5 support tool calling and vision?
- As documented by its free sources, Claude Opus 5.5 supports tool calling and accepts image input.
Limits are what each provider publishes; a dash means the provider publishes none, and no number here is guessed. Rows are re-checked monthly (how we verify).