Model comparison
GPT-5.2 vs GPT-5.2-Codex
Head-to-head evidence from 14 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.2 #64 (Estimated); GPT-5.2-Codex #58 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.2 and GPT-5.2-Codex share 14 comparable benchmark results. 0 of 8 categories are comparable. 14 results are unique to GPT-5.2; 1 to GPT-5.2-Codex.
Updated July 20, 2026- Shared results
- 14
- GPT-5.2 only
- 14
- GPT-5.2-Codex only
- 1
- Comparable categories
- 0 / 8
Benchmark data for GPT-5.2 and GPT-5.2-Codex is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 14 shared benchmark results across 5 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-5.2 | Δ | GPT-5.2-Codex |
|---|---|---|---|
| Agentic | GPT-5.255.7 | MarginNo overlap | GPT-5.2-CodexNot measured |
| Coding | GPT-5.270.6 | MarginNo overlap | GPT-5.2-CodexNot measured |
| Reasoning | GPT-5.252.9 | MarginNo overlap | GPT-5.2-CodexNot measured |
| Knowledge | GPT-5.292.4 | MarginNo overlap | GPT-5.2-CodexNot measured |
| Math | GPT-5.235.2 | MarginNo overlap | GPT-5.2-CodexNot measured |
| Multimodal | GPT-5.280.4 | MarginNo overlap | GPT-5.2-CodexNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.2 | GPT-5.2-Codex | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.2$1.75 input / $14 output | GPT-5.2-Codex$1.75 input / $14 output | Listed prices are equal. |
| Generation speedtokens per second | GPT-5.273 tok/s | GPT-5.2-Codex123 tok/s | GPT-5.2-Codex has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5.2130.34 s | GPT-5.2-Codex87.34 s | GPT-5.2-Codex reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5.2400K | GPT-5.2-Codex400K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding4 benchmarks
Reasoning3 benchmarks
Knowledge7 benchmarks
| Benchmark | GPT-5.2 | GPT-5.2-Codex | Result |
|---|---|---|---|
| GPQASource | 92.4% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 42.2% | 40.1% | GPT-5.2 leads |
| AA-GPQA DiamondSource | 90.3% | 89.9% | GPT-5.2 leads |
| AA-HLESource | 35.4% | 33.5% | GPT-5.2 leads |
| AA-Omniscience IndexSource | -1.0% | -2.5% | GPT-5.2 leads |
| AA-Omniscience AccuracySource | 43.8% | 40.7% | GPT-5.2 leads |
| AA-Omniscience Hallucination RateSource | 79.7% | 72.8% | GPT-5.2-Codex leads |
Math3 benchmarks
Multimodal6 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.2 | GPT-5.2-Codex | Result |
|---|---|---|---|
| AA-IFBenchSource | 75.4% | 77.6% | GPT-5.2-Codex leads |
Frequently Asked Questions (3)
Can I compare GPT-5.2 and GPT-5.2-Codex on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for GPT-5.2 and GPT-5.2-Codex today?
GPT-5.2: $1.75 input / $14.00 output per 1M tokens GPT-5.2-Codex: $1.75 input / $14.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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