Claude Sonnet 4.5 API

Model details

Context window

200K tokens

Max output

64K tokens

Input

Text, images

Output

Text

Capabilities

Reasoning, Vision, Tool calling, Streaming

Interfaces

OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses

Why teams pick it

• Claude Sonnet 4.5 for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.

Call Claude Sonnet 4.5

Claude Sonnet 4.5 answers on any of the APIs below — pick the one your code already speaks and just swap in your Inferray key.

curl https://api.inferray.com/v1/chat/completions \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-sonnet-4-5",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

curl https://api.inferray.com/v1/messages \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-sonnet-4-5",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

curl https://api.inferray.com/v1/responses \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-sonnet-4-5",
  "input": "Hello"
}'

Use Claude Sonnet 4.5 in your tools

Every coding agent below has a setup guide. Set the model to claude-sonnet-4-5.

• Claude Code
• Codex
• opencode
• Cline
• Roo Code
• Aider
• Continue

More from Anthropic

Alternatives to Claude Sonnet 4.5

• Kimi K3Long-horizon coding and end-to-end knowledge work.Moonshot AI
• Grok 4Grok 4 for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.xAI
• Mistral Large LatestMistral Large Latest for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.Mistral

Questions about this model

How much does the Claude Sonnet 4.5 API cost?

Claude Sonnet 4.5 costs $3 per 1M input tokens and $15 per 1M output tokens on Inferray, and cached input is $0.3 per 1M. That is the list price, with no gateway fee on top.

Is there a free tier for Claude Sonnet 4.5?

No. You add credit and pay Claude Sonnet 4.5's list rate for each request — seats, projects, and API keys are free, and pay-as-you-go credit never expires.

Am I charged for failed requests?

No. A request that fails without returning a result is not billed. If a response fails part-way, the tokens already processed before the failure are charged.

Is Claude Sonnet 4.5 included in Token Plans?

No. Claude Sonnet 4.5 is pay-as-you-go only; Token Plans cover the other text models in the catalog.

Can I use Claude Sonnet 4.5 in Claude Code?

Yes. Set ANTHROPIC_BASE_URL to https://api.inferray.com, ANTHROPIC_AUTH_TOKEN to your Inferray key, and ANTHROPIC_MODEL to claude-sonnet-4-5. The same key works in Codex, opencode, Cline, and other agents.

Does Claude Sonnet 4.5 support tool calling and vision?

Claude Sonnet 4.5 supports tool calling, image input, reasoning and streaming on Inferray.

Is it the real Claude Sonnet 4.5?

Yes. A request for claude-sonnet-4-5 is answered by Claude Sonnet 4.5 from Anthropic, billed at its published list price. Inferray never substitutes a different or smaller model.