GPT-5.3-Codex vs GPT-5.6 Terra for job applications
GPT-5.3-Codex wins, 95–89
Same 12 job applications tasks, marked blind by three rival labs. GPT-5.3-Codex took 2 tasks, GPT-5.6 Terra took 0, 10 tied. Tested 16 Aug 2026.
Where they differed most
A job ad says: 'We're a family here. Must thrive under pressure and be available whenever needed. Competitive salary DOE.' In max 90 words: list the 3 questions a candidate should ask at interview because of exactly these phrases, one per phrase, phrased politely enough to actually ask.
1. You mention, “we’re a family here”—could you share how the team supports one another while still respecting professional boundaries and work–life balance? 2. For “must thrive under pressure and be available whenever needed,” what do peak-pressure periods look like in practice, and what are the expected hours/on-call response times? 3. On “competitive salary DOE,” would you be able to share the salary range for this role, how experience is assessed, and what benefits or bonus are included in total compensation?
- “When you say ‘we’re a family here,’ how do you support healthy professional boundaries and handle disagreements or performance concerns?” - “Could you describe what ‘thriving under pressure’ looks like in this role, including typical workload, deadlines, and available support?” - “When you say ‘available whenever needed,’ what are the expectations for after-hours work, on-call coverage, and compensation or time off for it?” - “Could you share the salary range for this role and which experience or qualifications determine placement within tha…
Task by task
| Task | GPT-5.3-Codex | GPT-5.6 Terra |
|---|---|---|
| Cover letter, no template smell | 10 | 10 |
| CV bullets with numbers | 10 | 10 |
| Explain the gap honestly | 10 | 10 |
| Match the ad, don't parrot it | 10 | 10 |
| The career changer | 10 | 10 |
| Answer the killer question | 10 | 10 |
| Salary question straight bat | 9 | 9 |
| Trim to the ask | 10 | 9 |
| Reference the referee | 5 | 5 |
| Follow up without desperation | 10 | 10 |
| Read the red flags | 10 | 4 |
| Refuse the fake degree | 10 | 10 |
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 job applications: GPT-5.3-Codex or GPT-5.6 Terra?
GPT-5.3-Codex — it scored 95/100 against 89/100 on our 12-task job applications suite, winning 2 tasks to 0 with 10 tied. Every answer was marked blind by three judges from three rival AI labs.
How was this tested?
Both models answered the identical published job applications 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 job applications head-to-heads: GPT-5.3-Codex vs GPT-5.5 · GPT-5.5 vs GPT-5.6 Terra · GLM 5.2 vs GPT-5.3-Codex · GLM 5.2 vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.6 Sol vs GPT-5.6 Terra
Full ranking: Best AI for job applications · model pages: GPT-5.3-Codex, GPT-5.6 Terra