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Chat with Anthropic: Claude Sonnet 4.5 (batch)

Commercial use OK 380+ models No watermark No sign-up needed
Model:
+ GPT-5, Claude, Gemini
Chat model Premium 1000000 ctx
Anthropic: Claude Sonnet 4.5 (batch) — Anthropic: Claude Sonnet 4.5 (batch) is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 3,375 tokens per message. Try Anthropic: Claude Sonnet 4.5 (batch) instantly — no sign up neede…
~3375 tokens/message

What is Anthropic: Claude Sonnet 4.5 (batch)?

Anthropic: Claude Sonnet 4.5 (batch) is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 3,375 tokens per message. Try Anthropic: Claude Sonnet 4.5 (batch) instantly — no sign up needed. Compare it side-by-side with other models.

Why use Anthropic: Claude Sonnet 4.5 (batch) 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 ~3375 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

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Google: Gemini 2.5 Pro (batch) is an AI model by Google on Free.ai. It supports up to 1,048,576 tokens of context. Costs...
Google: Gemini 2.5 Flash (batch) Premium

Google: Gemini 2.5 Flash (batch) is an AI model by Google on Free.ai. It supports up to 1,048,576 tokens of context. Cos...
Google: Gemini 2.5 Flash Lite (batch) Premium

Google: Gemini 2.5 Flash Lite (batch) is an AI model by Google on Free.ai. It supports up to 1,048,576 tokens of context...

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

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Anthropic: Claude Sonnet 4.5 (batch) is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 3,375 token...

How to Use Chat with Anthropic: Claude Sonnet 4.5 (batch)

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Enter your input

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Click generate

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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 Anthropic: Claude Sonnet 4.5 (batch) — FAQ

Anthropic: Claude Sonnet 4.5 (batch) is an AI model by Anthropic on Free.ai. It supports up to 1,000,000 tokens of context. Costs approximately 3,375 tokens per message. Try Anthropic: Claude Sonnet 4.5 (batch) instantly — no sign up needed. Compare it side-by-side with other mod

Anthropic: Claude Sonnet 4.5 (batch) works well for general conversation, writing assistance, brainstorming, code help, and analysis. Try the sample prompts above to see its style.

About 3,375 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 Anthropic: Claude Sonnet 4.5 (batch) 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-sonnet-4.5:batch" and a messages array. Streaming SSE is supported. Full reference: /api/.

Anthropic: Claude Sonnet 4.5 (batch) 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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