Free Claude Opus 5 via the Tokenator API
What the model is for
This model is available on a free plan with set usage limits. Claude Opus 5 is Anthropic's flagship model for complex logical reasoning, programming, and long-term agent management. It is particularly effective in complex software development, code review and error detection, document and diagram analysis, complex office tasks, and coordinating multiple concurrent subagents. Claude Opus 5 reliably follows instructions and uses tools efficiently, even in lengthy, multi-step tasks. It is also well-suited for scenarios where low latency and more efficient token usage are essential.
Specification
| Full name | Free Claude Opus 5 |
| API ID | free-claude-opus-5 |
| Model vendor | Anthropic |
| Type | Text model (chat / completions) |
| Context window | 1M tokens |
| Max output | 128K tokens |
| Image input | yes |
| Tokenator usage multiplier | does not draw down the key limit4M tokens per day60 requests per dayresets at 00:00 UTC |
| Stability | Unstablethe model may need a retry or cut an answer short |
| Input modalities | text, image, file |
| Aliases | cursor-free-claude-opus-5 |
| Supported API formats | /v1/chat/completions /v1/responses /v1/messages |
| Upstream providers | 1 |
| Current status | available |
| Data updated | 2026-08-22 |
Upstream providers
| Provider | Multiplier |
|---|---|
| LimitedAI | 1.9× |
A request goes to the first available provider by priority; if it fails, Tokenator switches to the next one.
Example request
curl https://api.tokenator.top/v1/chat/completions \ -H "Authorization: Bearer sk-your-tokenator-key" \ -H "Content-Type: application/json" \ -d '{ "model": "free-claude-opus-5", "messages": [{"role": "user", "content": "Hello"}] }'
Compatible tools
The model can be used in any tool that accepts a custom base URL: Claude Code, Codex CLI, OpenCode, Cursor, Cline, Kilo Code, Cherry Studio, OpenClaw.
See also
FAQ about Free Claude Opus 5
What is the API ID of Free Claude Opus 5?
free-claude-opus-5 — put this into the model field of your request.
What context window does Free Claude Opus 5 have?
1M tokens; max output is 128K tokens.
How many tokens will a request cost?
(input + output) × 1.9×. See the documentation for details.
Which tools support this model?
Any tool that accepts a custom base URL: Claude Code, Codex CLI, OpenCode, Cursor, Cline, Kilo Code. Setup guides are in the integrations section.
Is Free Claude Opus 5 really free?
Yes. Requests to this model do not draw down your key's token limit — no multiplier is applied and your paid bundle stays untouched. A daily allowance applies instead: 4M tokens and 60 requests per day.
What is the limit on the free model and when does it reset?
The allowance — 4M tokens and 60 requests per day — is counted per key and per model, and resets at 00:00 UTC. Spending one free model's limit leaves the other free models usable.
What happens when the daily limit runs out?
The request returns 429 with the code free_model_daily_limit and a message stating what was spent and when it resets. Your paid key limit is left alone — there is no automatic switch to paid billing. The remaining allowance per free model is returned by /v1/tokens.
Do free models need a separate key?
No. The same key and the same base URL as for paid models — only the model field changes. The full list of free models is on its own page, and the mechanics are in the documentation.