GPT-5.3-Codex vs GPT-5.6 Terra for meeting notes
GPT-5.3-Codex wins, 91–88
Same 12 meeting notes tasks, marked blind by three rival labs. GPT-5.3-Codex took 3 tasks, GPT-5.6 Terra took 3, 6 tied. Tested 28 Aug 2026.
Where they differed most
Write the catch-up note for one named person. The meeting covered five items: the hosting migration (done, no action), Q3 headcount (two roles approved, one deferred), the outage post-mortem (actions on the infrastructure team), the rebrand timeline (slipping two weeks, marketing to confirm) and office parking (unresolved, nobody cares). The person who missed it is the marketing lead. Write their catch-up note. It must lead with what they personally now owe, keep what genuinely affects marketing, and cut what does not — a note that repeats all five items in order has failed the task. Use exactly 3 bullet points and no more. Under 120 words.
**Maya, catch-up from today:** - **You owe:** please confirm the revised rebrand timeline (currently slipping by ~2 weeks) and send the updated milestone dates/owners to the group by tomorrow 3pm. - The slip will move downstream marketing work (campaign launch, asset freeze, and external comms timing), so flag any knock-on risks when you confirm. - No other actions for marketing came out of this meeting.
- **Rebrand timeline:** The launch is slipping by two weeks. Please confirm the updated marketing plan, key dates, and any downstream comms impact. - **Q3 headcount:** Two roles were approved and one was deferred. Please review whether the deferred role affects marketing priorities or delivery plans and flag any concerns. - **Hosting migration:** Completed with no follow-up needed from marketing.
Task by task
| Task | GPT-5.3-Codex | GPT-5.6 Terra |
|---|---|---|
| The decision that was never made | 10 | 10 |
| Actions, owners, and the one with neither | 5 | 5 |
| The number said twice | 10 | 10 |
| Minutes for a meeting with a disagreement in it | 9 | 10 |
| Fourteen minutes, one sentence | 8 | 9 |
| Crosstalk | 9 | 10 |
| The musing that is not a commitment | 10 | 10 |
| The follow-up email nobody has to rewrite | 10 | 9 |
| Extract the dates, resolve the relatives | 10 | 10 |
| Who has not spoken | 10 | 10 |
| Notes for the person who missed it | 10 | 7 |
| The transcript is wrong | 8 | 6 |
Full receipts: GPT-5.3-Codex, GPT-5.6 Terra · judges claude-sonnet-5, gemini-3.1-pro-preview, grok-4.5
Questions people ask
Which is better for meeting notes: GPT-5.3-Codex or GPT-5.6 Terra?
GPT-5.3-Codex — it scored 91/100 against 88/100 on our 12-task meeting notes suite, winning 3 tasks to 3 with 6 tied. Every answer was marked blind by three judges from three rival AI labs.
How was this tested?
Both models answered the identical published meeting notes tasks. Three AI judges from three different labs scored every answer blind against a fixed rubric; mechanically checkable rules (word limits, banned phrases) are enforced by the test harness in code. The raw outputs and judge verdicts are downloadable.
More meeting notes head-to-heads: GPT-5.3-Codex vs Grok 4.5 · GPT-5.6 Terra vs Grok 4.5 · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.6 Sol vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.5 · GPT-5.5 vs GPT-5.6 Terra
Full ranking: Best AI for meeting notes · model pages: GPT-5.3-Codex, GPT-5.6 Terra