Model comparison
GPT-5.1-Codex vs Step 3.7 Flash
Head-to-head evidence from 15 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
BenchAlign evidence: GPT-5.1-Codex estimated; Step 3.7 Flash estimated. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.1-Codex and Step 3.7 Flash share 15 comparable benchmark results. 0 of 8 categories are comparable. 2 results are unique to GPT-5.1-Codex; 15 to Step 3.7 Flash.
Updated July 16, 2026- Shared results
- 15
- GPT-5.1-Codex only
- 2
- Step 3.7 Flash only
- 15
- Comparable categories
- 0 / 8
Benchmark data for GPT-5.1-Codex and Step 3.7 Flash is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 15 shared benchmark results across 6 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.
GPT-5.1-Codex has the larger context window at 400K, compared with 256K for Step 3.7 Flash.
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-5.1-Codex | Δ | Step 3.7 Flash |
|---|---|---|---|
| Agentic | GPT-5.1-CodexNot measured | MarginNo overlap | Step 3.7 Flash66.4 |
| Coding | GPT-5.1-CodexNot measured | MarginNo overlap | Step 3.7 Flash56.3 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.1-Codex | Step 3.7 Flash | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.1-CodexNot available | Step 3.7 Flash$0.2 input / $1.15 output | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.1-CodexNot available | Step 3.7 FlashNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.1-CodexNot available | Step 3.7 FlashNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.1-Codex400K | Step 3.7 Flash256K | GPT-5.1-Codex lists the larger context window. |
Benchmark Deep Dive
Agentic13 benchmarks
| Benchmark | GPT-5.1-Codex | Step 3.7 Flash | Result |
|---|---|---|---|
| τ²-bench resultsSource | 83% | 98.5% | Step 3.7 Flash leads |
| Gert LabsSource | 49.68% | 51.57% | Step 3.7 Flash leads |
| JobBenchSource | 26.2% | — | Not comparable |
| Terminal-Bench 2.0Source | — | 59.5% | Not comparable |
| BrowseCompSource | — | 75.8% | Not comparable |
| DeepSearchQASource | — | 92.8% | Not comparable |
| GDPval-AASource | — | 25.9% | Not comparable |
| ToolathlonSource | — | 49.5% | Not comparable |
| Claw-EvalSource | — | 67.1% | Not comparable |
| HLE w/ toolsSource | — | 47.2% | Not comparable |
| AA Agentic IndexSource | — | 21.5% | Not comparable |
| GDPval-AASource | — | 1017 | Not comparable |
| APEX-Agents-AASource | — | 14.8% | Not comparable |
Coding6 benchmarks
| Benchmark | GPT-5.1-Codex | Step 3.7 Flash | Result |
|---|---|---|---|
| Vibe Code BenchSource | 13.12% | — | Not comparable |
| Terminal-Bench HardSource | 34.8% | 35.6% | Step 3.7 Flash leads |
| AA-SciCodeSource | 40.2% | 40.0% | GPT-5.1-Codex leads |
| SWE-bench ProSource | — | 56.3% | Not comparable |
| Terminal-Bench 2.0Source | — | 59.5% | Not comparable |
| AA Coding IndexSource | — | 39.6% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-5.1-Codex | Step 3.7 Flash | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 34.7% | 30.3% | GPT-5.1-Codex leads |
| AA-GPQA DiamondSource | 86.0% | 80.9% | GPT-5.1-Codex leads |
| AA-HLESource | 23.4% | 19.9% | GPT-5.1-Codex leads |
| AA-Omniscience IndexSource | -6.0% | -37.5% | GPT-5.1-Codex leads |
| AA-Omniscience AccuracySource | 39.2% | 25.4% | GPT-5.1-Codex leads |
| AA-Omniscience Hallucination RateSource | 74.4% | 84.4% | GPT-5.1-Codex leads |
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.1-Codex | Step 3.7 Flash | Result |
|---|---|---|---|
| AA-IFBenchSource | 70.0% | 67.3% | GPT-5.1-Codex leads |
Frequently Asked Questions (3)
Can I compare GPT-5.1-Codex and Step 3.7 Flash 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-5.1-Codex and Step 3.7 Flash today?
Step 3.7 Flash: $0.20 input / $1.15 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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