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Chat with Claude Opus 5

Commercial use OK 380+ models No watermark No sign-up needed
Model:
+ GPT-5, Claude, Gemini
Chat model Premium 1000000 ctx
Claude Opus 5 — Claude Opus 5 is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 11,250 tokens per message. Try Claude Opus 5 instantly — no sign up needed. Compare it side-by-side with other models.
~11250 tokens/message

What is Claude Opus 5?

Claude Opus 5 is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 11,250 tokens per message. Try Claude Opus 5 instantly — no sign up needed. Compare it side-by-side with other models.

Why use Claude Opus 5 for chat?

Streaming responses

Replies stream token-by-token within ~1 second of pressing Send. No idle waiting.

Saved history

Signed-in users see every chat in /account/?tab=history with one-click share links.

Compare side by side

Send the same prompt to up to 4 models at /chat/compare/ and judge the outputs side by side.

Commercial use OK

Outputs are yours. Use them in apps, ads, docs, or anything else without attribution.

Sample prompts

Plan a 7-day Tokyo trip with kids, balancing food, parks, and museums
Draft a cold-outreach email to a VC introducing my dev-tools startup
Compare three approaches to rate-limiting an HTTP API and recommend one
Write a 600-word blog intro about why teams should self-host their AI
Outline a 30-minute presentation on quantum computing for a non-technical audience

Pricing

Premium chat. Cost is per message — typically ~11250 tokens, shown live before you send. Self-hosted chat runs free on your 30,000-token daily pool; premium models are pay-as-you-go, with top-ups from $1.

Compare to alternatives

Claude Opus 5 (Fast) Premium

Claude Opus 5 (Fast) is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approx...
Ling-3.0-flash Premium

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Google: Gemini 3.5 Flash Lite Premium

Google: Gemini 3.5 Flash Lite is an AI model by Google on Free.ai. It supports up to 1,048,576 tokens of context. Costs ...

Full model reference → · See all chat models → · Compare up to 4 chat models side-by-side →

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Claude Opus 5 is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 11,250 tokens per message. Try Cla...

How to Use Chat with Claude Opus 5

1
Enter your input

Type text, upload a file, or describe what you want. No account needed.

2
Click generate

Our AI processes your request in seconds using the best open-source models.

3
Download & share

Download, copy, or share your result. Free for personal and commercial use.

Use this tool via API

Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.

API Documentation Get API Key 
curl -X POST https://api.free.ai/v1/chat/ \
  -H "Authorization: Bearer sk-free-..." \
  -H "Content-Type: application/json" \
  -d '{"model": "qwen7b", "messages": [{"role": "user", "content": "Hello"}]}'

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Chat with Claude Opus 5 — FAQ

Claude Opus 5 is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 11,250 tokens per message. Try Claude Opus 5 instantly — no sign up needed. Compare it side-by-side with other models.

Claude Opus 5 works well for general conversation, writing assistance, brainstorming, code help, and analysis. Try the sample prompts above to see its style.

About 11,250 tokens per average message. Free accounts get a 30,000-token daily pool that covers self-hosted chat; premium models are pay-as-you-go, with token top-ups from $1.

It depends on the task. /chat/compare/ lets you send the same prompt to Claude Opus 5 and any other model side-by-side — comparison is the fastest way to decide.

Yes. Outputs are yours — Free.ai does not claim rights to anything you generate.

1,000,000 tokens.

Replies stream token-by-token within ~1 second. Total response time depends on length and model size — small models stream faster, frontier models trade speed for depth.

Yes. Signed-in users see every chat in /account/?tab=history. You can also share a one-link copy of any conversation via the Share button.

Free.ai does not train models on your conversations. Self-hosted models stay on our GPUs. Premium models route to the upstream provider for inference.

Yes. POST to /v1/chat/ with model="anthropic/claude-opus-5" and a messages array. Streaming SSE is supported. Full reference: /api/.

Claude Opus 5 is a premium model served by an external provider, so self-hosting is not available. Free.ai exposes it through token-based pricing.

Free accounts get a 30,000-token daily pool. When that runs out, token top-ups start at $1, pay-as-you-go — no subscription required.

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