Breaking

OpenAI Releases GPT-5.6 Broadly, Brings Codex Into ChatGPT

July 10, 2026 at 12:03 EDT

Foundation Models
AI Agents
Software Dev & Coding

On July 9, 2026, OpenAI made its new "GPT-5.6" model family broadly available and integrated its coding agent "Codex" into ChatGPT. The following day, it held an AMA on Reddit's r/Codex, inviting developer questions about GPT-5.6, Codex, and the new Sites and Computer Use features.

July 9, 2026 · OpenAI

GPT-5.6 Goes Live — Codex Moves Inside ChatGPT

A three-tier model family (Sol, Terra, Luna) launches with an agentic coding agent now built into ChatGPT — pushing cost efficiency and autonomy front and center against Anthropic's Claude Fable 5.

54%

better token efficiency in agentic coding

Sol coding agent index (Artificial Analysis)

62.6%

Sol on OSWorld 2.0 (Computer Use)

53.6

Sol score on Agents' Last Exam

Three tiers, three price points

Estimated API output price per 1M tokens — column height scales to cost.

$30

Sol

top performance

in $5 · out $30

$15

Terra

balanced

in $2.50 · out $15

Luna

fast, low cost

in $1 · out $6

What ships alongside the models

Codex in ChatGPT

The coding agent, once limited to desktop apps and the API, now runs inside ChatGPT.

Computer Use

AI views the screen and drives apps via mouse and keyboard — now with Windows support.

Sites

Instantly publishes generated websites and apps on OpenAI hosting.

Ultra mode

Runs multiple agents in parallel to accelerate long-running tasks.

Praise

Major upgrade over 5.5, with high autonomy
Browser operation finds and fixes bugs automatically
Under half the token use of Fable 5, and faster
Cursor, Notion, Shopify cite "tenacious problem-solving"

Criticism

Strict usage limits hit ceilings fast, even on Pro
Tightened guardrails make responses feel "cold"
Fable 5 still smarter in certain cases

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