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Anthropic: Claude Sonnet 4.5

Anthropic
Streaming
200K
Context
$3.00
Input /1M
$15.00
Output /1M
16K
Max Output
Run API Call Open in Chat

Anthropic: Claude Sonnet 4.5

Model Overview

Property Value
Model ID claude-sonnet-4-5-20250929
Name Claude Sonnet 4.5
Provider Anthropic
Released 2026-01-02

Description

Claude Sonnet 4.5 is Anthropic's balanced model with strong coding and reasoning capabilities.

Specifications

Spec Value
Context Window 200,000 tokens
Max Completion 16,384 tokens
Modalities Text

Pricing

Type Price
Input $3.00 per 1M tokens
Output $15.00 per 1M tokens

Capabilities

  • Text Generation: Yes
  • Vision: No
  • Tool Use: No
  • Extended Reasoning: No
  • Streaming: Yes

Use Cases

  • General text generation
  • Question answering
  • Content creation
  • Analysis and summarization

Integration with LangMart

Gateway Support: Type 2 (Cloud), Type 3 (Self-hosted)

API Usage:

curl -X POST https://api.langmart.ai/v1/chat/completions \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "messages": [{"role": "user", "content": "Hello"}],
    "max_tokens": 2048
  }'
  • Variants available on LangMart

Last Updated: 2026-09-01