Model comparison
GPT-OSS 20B vs LFM2.5-8B-A1B
Head-to-head evidence from 12 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
BenchAlign evidence: GPT-OSS 20B supported; LFM2.5-8B-A1B estimated. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-OSS 20B and LFM2.5-8B-A1B share 12 comparable benchmark results. 0 of 8 categories are comparable. 7 results are unique to GPT-OSS 20B; 6 to LFM2.5-8B-A1B.
Updated July 16, 2026- Shared results
- 12
- GPT-OSS 20B only
- 7
- LFM2.5-8B-A1B only
- 6
- Comparable categories
- 0 / 8
Benchmark data for GPT-OSS 20B and LFM2.5-8B-A1B 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.
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-OSS 20B | Δ | LFM2.5-8B-A1B |
|---|---|---|---|
| Math | GPT-OSS 20BNot measured | MarginNo overlap | LFM2.5-8B-A1B50.0 |
| Inst. Following | GPT-OSS 20BNot measured | MarginNo overlap | LFM2.5-8B-A1B68.8 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-OSS 20B | LFM2.5-8B-A1B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-OSS 20B$0 input / $0 output | LFM2.5-8B-A1B$0 input / $0 output | Listed prices are equal. |
| Generation speedtokens per second | GPT-OSS 20B313 tok/s | LFM2.5-8B-A1BNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-OSS 20B0.65 s | LFM2.5-8B-A1BNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-OSS 20B128K | LFM2.5-8B-A1B128K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic6 benchmarks
Coding4 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-OSS 20B | LFM2.5-8B-A1B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 14.9% | 8.3% | GPT-OSS 20B leads |
| AA-GPQA DiamondSource | 68.8% | 51.3% | GPT-OSS 20B leads |
| AA-HLESource | 9.8% | 6.9% | GPT-OSS 20B leads |
| AA-Omniscience IndexSource | -63.9% | -33.3% | LFM2.5-8B-A1B leads |
| AA-Omniscience AccuracySource | 15.5% | 9.4% | GPT-OSS 20B leads |
| AA-Omniscience Hallucination RateSource | 94.1% | 47.0% | LFM2.5-8B-A1B leads |
Math3 benchmarks
Multimodal1 benchmarks
| Benchmark | GPT-OSS 20B | LFM2.5-8B-A1B | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 887 | — | Not comparable |
Frequently Asked Questions (3)
Can I compare GPT-OSS 20B and LFM2.5-8B-A1B 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 LFM2.5-8B-A1B today?
GPT-OSS 20B: $0.00 input / $0.00 output per 1M tokens LFM2.5-8B-A1B: $0.00 input / $0.00 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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