What is the context window of Agentic Chat (Claude Sonnet 4.5) by GitLab Duo?

Agentic Chat (Claude Sonnet 4.5) by GitLab Duo has a context window of 200K tokens. It supports up to 200K input tokens and can generate up to 64K output tokens.

What are the capabilities of Agentic Chat (Claude Sonnet 4.5) by GitLab Duo?

Agentic Chat (Claude Sonnet 4.5) by GitLab Duo supports advanced reasoning, tool calling/function calling, adjustable temperature, file attachments. It has closed weights.

What input and output types does Agentic Chat (Claude Sonnet 4.5) support?

Agentic Chat (Claude Sonnet 4.5) by GitLab Duo accepts text, image, pdf as input and can generate text as output.

Does Agentic Chat (Claude Sonnet 4.5) by GitLab Duo support reasoning?

Yes, Agentic Chat (Claude Sonnet 4.5) by GitLab Duo supports advanced reasoning capabilities.

Is Agentic Chat (Claude Sonnet 4.5) by GitLab Duo open source?

No, Agentic Chat (Claude Sonnet 4.5) by GitLab Duo has closed weights. The model is only available through the GitLab Duo API.

Does Agentic Chat (Claude Sonnet 4.5) support function calling?

Yes, Agentic Chat (Claude Sonnet 4.5) by GitLab Duo supports tool calling (also known as function calling), allowing it to interact with external tools and APIs during conversations.

What is the knowledge cutoff date for Agentic Chat (Claude Sonnet 4.5)?

Agentic Chat (Claude Sonnet 4.5) by GitLab Duo has a knowledge cutoff date of 2025-07-31. This means the model was trained on data available up until that date.

Back to Models

Agentic Chat (Claude Sonnet 4.5) API

GitLab Duo

About

Build advanced reasoning agents with Agentic Chat (Claude Sonnet 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 Sonnet 4.5) via the GitLab Duo API with up to 64K output tokens.

Capabilities

Input Modalities

textimagepdf

Output Modalities

text

Reasoning

Yes

Structured Output

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 Sonnet 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

duo-chat-sonnet-4-5

Provider

GitLab Duo

Family

claude-sonnet

Release Date

Jan 8, 2026

Knowledge Cutoff

Jul 31, 2025

API Integration

NPM Package

gitlab-ai-provider

Environment Variables

GITLAB_TOKEN

Documentation