Claude Opus 4.5 (20251101) API
About
Build advanced reasoning agents with Claude Opus 4.5 (20251101), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $5.00/1M input and $25.00/1M output tokens, native tool calling support. Access Claude Opus 4.5 (20251101) via the Merge Gateway API with up to 64K output tokens.
Capabilities
Input Modalities
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Output Modalities
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Limits
Context Window
200K
Tokens
Input Limit
200K
Tokens
Max Output
64K
Tokens
Pricing
Standard (per 1M tokens)
Input
$5.00
Output
$25.00
Caching (per 1M tokens)
Read
$0.50
Write
$6.25
Frequently Asked Questions
Claude Opus 4.5 (20251101) by Merge Gateway costs $5.00 per 1M input tokens and $25.00 per 1M output tokens. Cached reads cost $0.50 per 1M tokens. Cache writes cost $6.25 per 1M tokens.
Model Details
ID
anthropic/claude-opus-4-5-20251101
Provider
Merge GatewayFamily
claude-opus
Release Date
Nov 1, 2025
Knowledge Cutoff
May 1, 2025
API Integration
NPM Package
merge-gateway-ai-sdk-provider
Environment Variables
MERGE_GATEWAY_API_KEY
API Base URL
https://api-gateway.merge.dev/v1/ai-sdk