Model comparison
GPT-OSS 20B vs Mistral Large 3
Head-to-head evidence from 15 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-OSS 20B #159 (Supported); Mistral Large 3 #113 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-OSS 20B and Mistral Large 3 share 15 comparable benchmark results. 0 of 8 categories are comparable. 3 results are unique to GPT-OSS 20B; 1 to Mistral Large 3.
Updated July 20, 2026- Shared results
- 15
- GPT-OSS 20B only
- 3
- Mistral Large 3 only
- 1
- Comparable categories
- 0 / 8
Benchmark data for GPT-OSS 20B and Mistral Large 3 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 15 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.
Mistral Large 3 is priced at $0.50 input / $1.50 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for GPT-OSS 20B.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-OSS 20B | Mistral Large 3 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-OSS 20B$0 input / $0 output | Mistral Large 3$0.5 input / $1.5 output | GPT-OSS 20B has the lower combined listed price. |
| Generation speedtokens per second | GPT-OSS 20B313 tok/s | Mistral Large 348 tok/s | GPT-OSS 20B has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-OSS 20B0.65 s | Mistral Large 31.04 s | GPT-OSS 20B reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-OSS 20B128K | Mistral Large 3128K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-OSS 20B | Mistral Large 3 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 14.9% | 15.9% | Mistral Large 3 leads |
| AA-GPQA DiamondSource | 68.8% | 68.0% | GPT-OSS 20B leads |
| AA-HLESource | 9.8% | 4.1% | GPT-OSS 20B leads |
| AA-Omniscience IndexSource | -63.9% | -39.4% | Mistral Large 3 leads |
| AA-Omniscience AccuracySource | 15.5% | 24.1% | Mistral Large 3 leads |
| AA-Omniscience Hallucination RateSource | 94.1% | 83.7% | Mistral Large 3 leads |
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-OSS 20B | Mistral Large 3 | Result |
|---|---|---|---|
| AA-IFBenchSource | 65.1% | 36.2% | GPT-OSS 20B leads |
Frequently Asked Questions (3)
Can I compare GPT-OSS 20B and Mistral Large 3 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-OSS 20B and Mistral Large 3 today?
GPT-OSS 20B: $0.00 input / $0.00 output per 1M tokens Mistral Large 3: $0.50 input / $1.50 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
Self-host vs API cost
Estimates at 50,000 req/day · 1000 tokens/req average.
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