Model comparison
Claude Sonnet 5 vs LFM2.5-8B-A1B
Head-to-head evidence from 9 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Sonnet 5 #29 (Estimated); LFM2.5-8B-A1B #166 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Sonnet 5 and LFM2.5-8B-A1B share 9 comparable benchmark results. 0 of 8 categories are comparable. 27 results are unique to Claude Sonnet 5; 8 to LFM2.5-8B-A1B.
Updated July 23, 2026- Shared results
- 9
- Claude Sonnet 5 only
- 27
- LFM2.5-8B-A1B only
- 8
- Comparable categories
- 0 / 8
Benchmark data for Claude Sonnet 5 and LFM2.5-8B-A1B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 9 shared benchmark results across 3 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.
Claude Sonnet 5 is priced at $2.00 input / $10.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for LFM2.5-8B-A1B. Claude Sonnet 5 has the larger context window at 1M, compared with 128K for LFM2.5-8B-A1B.
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 | Claude Sonnet 5 | Δ | LFM2.5-8B-A1B |
|---|---|---|---|
| Agentic | Claude Sonnet 581.9 | MarginNo overlap | LFM2.5-8B-A1BNot measured |
| Coding | Claude Sonnet 576.7 | MarginNo overlap | LFM2.5-8B-A1BNot measured |
| Knowledge | Claude Sonnet 557.4 | MarginNo overlap | LFM2.5-8B-A1BNot measured |
| Math | Claude Sonnet 5Not measured | MarginNo overlap | LFM2.5-8B-A1B50.0 |
| Multimodal | Claude Sonnet 588.3 | MarginNo overlap | LFM2.5-8B-A1BNot measured |
| Inst. Following | Claude Sonnet 5Not 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 | Claude Sonnet 5 | LFM2.5-8B-A1B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Sonnet 5$2 input / $10 output | LFM2.5-8B-A1B$0 input / $0 output | LFM2.5-8B-A1B has the lower combined listed price. |
| Generation speedtokens per second | Claude Sonnet 5Not available | LFM2.5-8B-A1BNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Sonnet 5Not available | LFM2.5-8B-A1BNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Sonnet 51M | LFM2.5-8B-A1B128K | Claude Sonnet 5 lists the larger context window. |
Benchmark Deep Dive
Agentic15 benchmarks
| Benchmark | Claude Sonnet 5 | LFM2.5-8B-A1B | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 80.4% | — | Not comparable |
| BrowseCompSource | 84.7% | — | Not comparable |
| HLE w/ toolsSource | 57.4% | — | Not comparable |
| OSWorld-VerifiedSource | 81.2% | — | Not comparable |
| GDPval-AASource | 1607 | — | Not comparable |
| AA Agentic IndexSource | 46.7% | — | Not comparable |
| GDPval-AASource | 55.4% | — | Not comparable |
| AA BriefcaseSource | 1388 | — | Not comparable |
| AA AutomationBenchSource | 39.2% | — | Not comparable |
| AA EnterpriseOps-GymSource | 44.7% | — | Not comparable |
| AA Harvey LABSource | 90.1% | — | Not comparable |
| AA Tau3 BankingSource | 28.2% | — | Not comparable |
| aaTerminalBench21Source | 80.5% | — | Not comparable |
| BFCL v4Source | — | 49.7% | Not comparable |
| τ²-bench resultsSource | — | 16.1% | Not comparable |
Coding9 benchmarks
| Benchmark | Claude Sonnet 5 | LFM2.5-8B-A1B | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 85.2% | — | Not comparable |
| SWE-bench ProSource | 63.2% | — | Not comparable |
| SWE MultilingualSource | 78.3% | — | Not comparable |
| SWE MultimodalSource | 28.1% | — | Not comparable |
| Terminal-Bench 2.0Source | 80.4% | — | Not comparable |
| FrontierCode 1.1 MainSource | 42.7% | — | Not comparable |
| cursorBench32Source | 61.5% | — | Not comparable |
| AA Coding IndexSource | 71.5% | — | Not comparable |
| AA-SciCodeSource | 53.6% | 7.8% | Claude Sonnet 5 leads |
Reasoning2 benchmarks
Knowledge8 benchmarks
| Benchmark | Claude Sonnet 5 | LFM2.5-8B-A1B | Result |
|---|---|---|---|
| HLESource | 57.4% | — | Not comparable |
| HLE w/o toolsSource | 43.2% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 53.4% | 8.3% | Claude Sonnet 5 leads |
| AA-GPQA DiamondSource | 91.1% | 51.3% | Claude Sonnet 5 leads |
| AA-HLESource | 39.6% | 6.9% | Claude Sonnet 5 leads |
| AA-Omniscience IndexSource | 15.3% | -33.3% | Claude Sonnet 5 leads |
| AA-Omniscience AccuracySource | 38.3% | 9.4% | Claude Sonnet 5 leads |
| AA-Omniscience Hallucination RateSource | 37.3% | 47.0% | Claude Sonnet 5 leads |
Math3 benchmarks
Multimodal4 benchmarks
Frequently Asked Questions (3)
Can I compare Claude Sonnet 5 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 Claude Sonnet 5 and LFM2.5-8B-A1B today?
Claude Sonnet 5: $2.00 input / $10.00 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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