Model comparison
GPT-5.1-Codex vs MiMo-V2-Pro
Head-to-head evidence from 12 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.1-Codex #99 (Estimated); MiMo-V2-Pro #17 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.1-Codex and MiMo-V2-Pro share 12 comparable benchmark results. 0 of 8 categories are comparable. 4 results are unique to GPT-5.1-Codex; 3 to MiMo-V2-Pro.
Updated July 23, 2026- Shared results
- 12
- GPT-5.1-Codex only
- 4
- MiMo-V2-Pro only
- 3
- Comparable categories
- 0 / 8
Benchmark data for GPT-5.1-Codex and MiMo-V2-Pro is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 12 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.
MiMo-V2-Pro has the larger context window at 1M, compared with 400K for GPT-5.1-Codex.
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 | MiMo-V2-Pro |
|---|---|---|---|
| Coding | GPT-5.1-CodexNot measured | MarginNo overlap | MiMo-V2-Pro78.0 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.1-Codex | MiMo-V2-Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.1-CodexNot available | MiMo-V2-ProNot available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.1-CodexNot available | MiMo-V2-ProNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.1-CodexNot available | MiMo-V2-ProNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.1-Codex400K | MiMo-V2-Pro1M | MiMo-V2-Pro lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 34.7% | 40.3% | MiMo-V2-Pro leads |
| AA-GPQA DiamondSource | 86.0% | 87.0% | MiMo-V2-Pro leads |
| AA-HLESource | 23.4% | 28.3% | MiMo-V2-Pro leads |
| AA-Omniscience IndexSource | -6.0% | 4.9% | MiMo-V2-Pro leads |
| AA-Omniscience AccuracySource | 39.2% | 26.8% | GPT-5.1-Codex leads |
| AA-Omniscience Hallucination RateSource | 74.4% | 29.9% | MiMo-V2-Pro leads |
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | 70.0% | 68.8% | GPT-5.1-Codex leads |
Frequently Asked Questions (2)
Can I compare GPT-5.1-Codex and MiMo-V2-Pro 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.
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