Fetching from the wire…
01
02
03
04
05
06
07
08
Public story · 2026-07-19 · high
The same release splits GPT-5.6 into three cost tiers, Sol, Terra, and Luna, letting teams trade capability for speed by task.
Why now: Ten days after the July 9 merge, tier habits are still forming, before defaults calcify around whichever tier ships pre-selected.
OpenAI folded its standalone Codex app into ChatGPT desktop on July 9, per the company's changelog.
Codex keeps its own mode next to Chat and Work. Anyone running agentic coding sessions no longer needs a separate app to review a diff or merge a pull request.
The merged app adds inline diff editing and a side panel for pull request review. It also brings faster Computer Use automation on GPT-5.6, plus support for working across multiple repositories in one project.
GPT-5.6 also splits into three tiers with this release. Sol targets complex coding and security work. Terra and Luna trade capability for cost, with Luna the fastest and cheapest of the three.
OpenAI's split mirrors the tiering discipline Anthropic already pushed onto its own users: pick a tier by task, not by habit.
The changelog doesn't say how pricing compares across the three tiers, so it's hard to know yet how much a routing habit actually saves.
Each link below shares sources, entities, or timing with this story.
Alongside GPT-5.6, OpenAI folded Codex into the ChatGPT desktop client with faster Computer Use, inline Markdown/code editing, GitHub PR review in the sidebar next to the diff, and multi-repo work in one project. The agent surface is consolidating into the chat client, and the...
GPT-5.6 Luna went to $0.20 input / $1.20 output per million tokens on July 30. That's an 80% cut. Terra dropped 20%. Luna's input now undercuts Gemini 3.1 Flash-Lite ($0.25/$1.50) and sits at one-fifth of Claude Haiku 4.5's $1 input. Simon Willison covered the announcement and...
The July 18 release notes bundle fixes that restore the full window, which means it had been silently degraded for some unspecified period. If you benchmarked those models in Codex over the past few weeks and found long-context performance underwhelming, you may have been meas...
OpenAI launched the GPT-5.6 family on July 14: Sol (flagship), Terra (cost-optimized), and Luna (fast tier), live across ChatGPT, Codex, and the API the same day after a US-government-requested delay for security review. The numbers are loud. Sol scored 53.6 on Agents' Last Ex...
Day three of Plus subscribers reporting that GPT-5.6 Sol at High reasoning returns near-instant, shallow answers, and that the assistant identifies itself as GPT-5.5-mini while the model picker still reads Sol. The r/ChatGPT thread is matched by a separate r/OpenAI report and...
The Codex changelog migrates internal GPT-5.4 selections to GPT-5.6 Terra and Luna, restores Guardian auto-review's prior policy and tool behavior after a prompting regression, and refreshes the bundled OpenAI Docs skill. Startup and large-context overhead dropped via concurre...
MindPattern daily
One email a day at 7 AM. Sources and a take on every story. Unsubscribe anytime.