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Anthropic — claude-sonnet-5-5 logo

Claude Sonnet 5.5

by Anthropic · Released 2026

The best combination of speed and intelligence. 1M-token context, image input, tool calling and reasoning. Pro plan and up.

Anthropic — claude-sonnet-5-5 logo
LLM Chat

Claude Sonnet 5.5

Powered by Anthropic · Not disclosed

Context Window

1M

Parameters

Not disclosed

Max Output

128K

Category

LLM Chat

Overview

Claude Sonnet 5.5 is Anthropic's model with the best combination of speed and intelligence. On CallMissed you call it with the id `claude-sonnet-5-5` on the OpenAI-compatible `/v1/chat/completions` endpoint with your `cm_` API key.

Anthropic documents a 1,000,000-token context window, up to 128,000 output tokens, image and text input with text output, tool calling, and a reasoning effort setting with levels low, medium, high, xhigh and max. The knowledge cutoff is June 2026.

Pricing on CallMissed is $2.00 per million input tokens and $10.00 per million output tokens. Claude Sonnet 5.5 is available on the Pro plan and up.

Pricing

MetricPrice
Input /1M tokens₹200.0000
Output /1M tokens₹1000.0000

1 credit = ₹1 ≈ US$0.0104 (US$1 = ₹96). Transparent per-call pricing — you pay only for what you call, with no seat fees or minimums.

Key Highlights

  • The best combination of speed and intelligence in the Claude 5.5 family
  • 1M-token context window and up to 128K output tokens
  • Image and text input, text output
  • Reasoning effort control: low, medium, high, xhigh, max
  • Pro plan and up

Technical Details

  • Context window: 1,000,000 tokens
  • Max output: 128,000 tokens
  • Input: image and text; output: text
  • Tool calling and streaming on the OpenAI-compatible gateway
  • Reasoning effort: low, medium, high, xhigh, max
  • Knowledge cutoff: June 2026
  • Available on the Pro plan and up

Strengths

  • Balanced speed, quality and price for everyday production use
  • 1M context for long conversations and documents
  • Native tool calling and image understanding

Limitations

  • Not the cheapest option for simple classification
  • Higher reasoning effort adds latency
  • Pro plan and up only

Use Cases

Customer support agentsCoding assistantsDocument and image understandingTool-using workflows

API Example

curl https://api.callmissed.com/v1/chat/completions \
  -H "Authorization: Bearer cm_YOUR_KEY" \
  -d '{"model": "claude-sonnet-5-5", "messages": [{"role": "user", "content": "Summarize this support thread and draft a reply"}]}'

Endpoint: POST /v1/chat/completions · Model ID: claude-sonnet-5-5

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