Agentic Chat (Claude Opus 4.5) API
About
Build advanced reasoning agents with Agentic Chat (Claude Opus 4.5), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support. Access Agentic Chat (Claude Opus 4.5) via the GitLab Duo API with up to 64K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
200K
Tokens
Input Limit
200K
Tokens
Max Output
64K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Caching (per 1M tokens)
Read
Free
Write
Free
Frequently Asked Questions
Agentic Chat (Claude Opus 4.5) by GitLab Duo costs Free per 1M input tokens and Free per 1M output tokens. Cached reads cost Free per 1M tokens. Cache writes cost Free per 1M tokens.
Model Details
ID
duo-chat-opus-4-5
Provider
GitLab DuoFamily
claude-opus
Release Date
Jan 8, 2026
Knowledge Cutoff
Mar 31, 2025
API Integration