GPT-5.3-Codex vs Grok 4.7
GPT-5.3-Codex 
Grok 4.7 Verdict
- GPT-5.3-Codex (xhigh) and Grok 4.7 (high) are level on quality (65.3 vs 65.8).
- GPT-5.3-Codex (xhigh) is stronger in agents & tools, coding, instruction following, long context, multimodal.
- Grok 4.7 (high) is stronger in composite, knowledge, reasoning.
- Grok 4.7 (high) is 1.6× cheaper ($3.00 vs $4.81 per 1M blended).
- GPT-5.3-Codex (xhigh) streams 3.1× faster (170 vs 55 tokens per second).
| Metric | GPT-5.3-Codex (xhigh) | Grok 4.7 (high) |
|---|---|---|
| BenchLeader Index | 65.3 | 65.8 |
| Agents & tools score | 79.8 | – |
| Coding score | 61.7 | – |
| Composite score | 70.0 | 87.5 |
| Instruction following score | 73.4 | – |
| Knowledge score | 69.2 | 72.6 |
| Long context score | 68.1 | 64.8 |
| Multimodal score | 63.0 | – |
| Reasoning score | 74.2 | 76.4 |
| Blended price $/M | $4.81 | $3.00 |
| Output speed | 170 tok/s | 55 tok/s |
| Time to first answer | 61.5 s | 1.4 s |
| Context window | 400k | 500k |
| WeirdML | 77.9% | – |
| AA Intelligence Index | 32.5 | 46.3 |
| IFBench | 75.4% | – |
| AA-LCR | 83.3% | 77.0% |
| MMMU-Pro | 78.5% | – |
| AA-Omniscience | 10.9 | 30.9 |
| Terminal-Bench Hard | 53.0% | – |
| GPQA Diamond (AA) | 91.5% | – |
| Humanity's Last Exam (AA) | 42.5% | 42.3% |
| SciCode (AA) | – | 57.8% |
| τ²-Bench Telecom (AA) | 86.0% | – |
| LiveCodeBench | 87.3% | – |
| IOI | 53.8% | – |
| LegalBench | – | 85.1% |
| SWE-bench (Vals) | 78.0% | – |
| CritPt | 16.9% | 18.0% |
| GDPval (AA) | – | 59.7% |
| Code Migration | – | 34.7% |
| Excel Modeling Benchmark | – | 54.9% |
| Harvey's Legal Agent Benchmark | – | 19.6% |
| Legal Research Bench | – | 39.9% |
| MedCode | – | 48.7% |
| MedScribe | – | 87.2% |
| ProgramBench | – | 0.0% |
| Public Benefits Bench | – | 68.5% |
| SAGE | – | 31.0% |
| Vibe Code Bench v1.1 | 61.8% | – |
| ALE-Bench | 1655.2 | – |
Data as of 2026-09-21. Best configuration of each model; every score links to its source on the model pages.
GPT-5.3-Codex vs Grok 4.7: questions
- Is GPT-5.3-Codex better than Grok 4.7?
- GPT-5.3-Codex (xhigh) and Grok 4.7 (high) are level on quality (65.3 vs 65.8). The BenchLeader Index combines every independent quality benchmark; Grok 4.7 (high) is ahead overall as of 2026-09-21, but check the category scores for your use.
- Which is cheaper, GPT-5.3-Codex or Grok 4.7?
- Grok 4.7 is cheaper: $3.00 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.3-Codex or Grok 4.7?
- GPT-5.3-Codex streams faster: 170 against 55 output tokens per second.
- Which has the larger context window?
- Grok 4.7 accepts more context: 500k against 400k tokens.