OpenAI/GPT-5/Feb 5, 2026
GPT-5.3 Codex Spark
Speed-optimized distillation of GPT-5.3 Codex running on Cerebras WSE-3 hardware. Achieves 1,000+ tokens/sec — 15x faster than the full Codex — while matching its benchmark scores on SWE-Bench Pro (56.8%) and Terminal-Bench 2.0 (77.3%). 50% faster TTFT and 80% reduction in roundtrip overhead.
textcodereasoningtool-use
Arena ELO
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Input Price
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Output Price
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Speed
1000 t/s
Context
128K
Latency
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Capability Assessment
SWE-Bench Pro80.0%
Terminal-Bench 2.077.3%
Comparative Analysis
| Metric | GPT-5.3 Codex Spark | Claude Opus 4.6 | Gemini 3.1 Pro | Grok 4 |
|---|---|---|---|---|
| SWE-bench | 80.0% | 80.8% | 80.6% | 72.0% |
| AIME 2025 | 94.0% | 100.0% | 91.2% | 94.0% |
| GPQA Diamond | — | 91.3% | 94.3% | 88.0% |
| MMLU | — | 91.0% | 92.6% | — |
| Input $/M | — | $5 | $2 | $3 |
| Output $/M | — | $25 | $12 | $15 |