---
id: "anthropic/claude-sonnet-4.5"
also: ["anthropic/claude-4.5-sonnet-20250929", "requesty/anthropic/claude-sonnet-4-5", "vercel/anthropic/claude-sonnet-4.5"]
card_usd_per_m: "3.0 in, 15.0 out, at anthropic"
cheapest_list_usd_per_m: "3.0 in, 15.0 out, at amazon-bedrock on openrouter"
cheapest_effective_usd_per_m: "0.6023 in, 16.4995 out, at google-vertex/us-east5 on openrouter"
context: 1000000
max_output: 64000
input: ["text", "image", "file"]
output: ["text"]
released: "2025-09-29"
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_completion_tokens", "max_tokens", "reasoning", "response_format", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "top_k", "top_p"]
endpoints: 24
gateways: "requesty (12), openrouter (9), vercel (3)"
no_training: 22
trains: 0
retains_prompts: 4
coding: 52.1000
agentic: 15.8000
---
# Anthropic: Claude Sonnet 4.5

Anthropic's most intelligent model. The first hybrid reasoning model on the market with the highest level of intelligence and capability with toggleable extended thinking. Top-tier results in reasoning, coding, multilingual tasks, long-context handling, honesty, and image processing.