Agentic Chat (Claude Opus 5)

gpt-lunaReasoningTool CallingAttachmentsStructured Output

Cost-efficient GPT-5.6 model for fast, high-volume workloads

Providers25

ReleasedJan 8, 2026

Input Modalitiestext, image, pdf

Output Modalitiestext

Tarsk Usecoding

Available Providers (25)

Provider	Model ID	Input Cost	Output Cost	Context	Max Output
GitLab Duo	`duo-chat-gpt-5-6-luna`	$0/MTok	$0/MTok	1.1M	128K
GitLab Duo	`duo-chat-opus-5`	$0/MTok	$0/MTok	1M	128K
GitLab Duo	`duo-chat-opus-4-8`	$0/MTok	$0/MTok	1M	128K
GitLab Duo	`duo-chat-gpt-5-1`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-gpt-5-2`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-gpt-5-4-nano`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-haiku-4-5`	$0/MTok	$0/MTok	200K	64K
GitLab Duo	`duo-chat-opus-4-6`	$0/MTok	$0/MTok	1M	64K
GitLab Duo	`duo-chat-gpt-5-6-terra`	$0/MTok	$0/MTok	1.1M	128K
GitLab Duo	`duo-chat-sonnet-5`	$0/MTok	$0/MTok	1M	64K
GitLab Duo	`duo-chat-opus-4-5`	$0/MTok	$0/MTok	200K	64K
GitLab Duo	`duo-chat-gpt-6-astra`	$0/MTok	$0/MTok	1.1M	128K
GitLab Duo	`duo-chat-gpt-5-3-codex`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-fable-5-1`	$0/MTok	$0/MTok	1M	128K
GitLab Duo	`duo-chat-gpt-5-4-mini`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-sonnet-4-6`	$0/MTok	$0/MTok	1M	64K
GitLab Duo	`duo-chat-gpt-5-5`	$0/MTok	$0/MTok	1.1M	128K
GitLab Duo	`duo-chat-fable-5`	$0/MTok	$0/MTok	1M	128K
GitLab Duo	`duo-chat-opus-4-7`	$0/MTok	$0/MTok	1M	64K
GitLab Duo	`duo-chat-gpt-5-4`	$0/MTok	$0/MTok	1.1M	128K
GitLab Duo	`duo-chat-gpt-5-6-sol`	$0/MTok	$0/MTok	1.1M	128K
GitLab Duo	`duo-chat-gpt-5-2-codex`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-gpt-5-codex`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-gpt-5-mini`	$0/MTok	$0/MTok	400K	128K
GitLab Duo	`duo-chat-sonnet-4-5`	$0/MTok	$0/MTok	200K	64K

Reasoning

Tool Calling

Attachments

Open Weights

Structured Output