LG AI ResearchExaone 4.0 1.2B
Exaone 4.0 1.2B is a LG AI Research open-weights reasoning model, released 15 Jul 2025. Its best configuration (no reasoning reasoning effort) ranks #729 of 785 on the BenchLeader Index at 37.5 ±4.9, in the lower half. The ± is the point: 206 other configurations score within that range, so they and this one cannot be told apart on quality alone — price and speed are what separate them. It scores highest in reasoning (41) and lowest in long context (23). It has been measured at 2 reasoning-effort settings; this summary describes the best-scoring one, and the tabs above switch between them. Last measured 15 Jul 2025.stale: no new result in six months
- Blended price
- –
- Output speed
- –
- First answer
- –
- Context
- 64k
- Full answer
- –
- Cost per run
- –
- Released
- 15 Jul 2025
- Overall index38
- Reasoning41
- Agents & tools34
- Knowledge24
- Instruction following30
- Long context23
- Composite35
Reasoning-effort configurations
The same model behaves differently depending on how much it is allowed to think. Each row is one setting, scored only on the benchmarks that were run at that setting. “Not stated” collects results from publishers that did not say which setting they used; for a reasoning model that is usually its thinking mode, but we do not assume it. Pick a setting here or at the top of the page to see its price, speed and category scores.
| Effort | Index | Rank | Speed | First answer | Chat reply cost | Categories |
|---|---|---|---|---|---|---|
| no reasoningbest | 37.5 | #729 | – | – | – | Agents & tools 34 · Composite 35 · Instruction following 30 · Knowledge 24 · Long context 23 · Reasoning 41 |
| thinking | 37.4 | #732 | – | – | – | Agents & tools 34 · Composite 35 · Instruction following 28 · Knowledge 26 · Long context 23 · Reasoning 41 |
How its index has moved
9 Sept 2026 to 21 Oct 2026- no reasoning
- thinking
The index is recomputed from scratch every day, so a line moves when a new benchmark result lands, when a publisher revises a score, or when the models it is normalised against change. Early movement usually means the score is still settling.
Benchmark results
See all LLM benchmarks. One column per reasoning effort. Rank is among every configuration of every model on that benchmark. Hover a score for the run it came from.
Reasoning
| Benchmark | no reasoning | thinking | Source |
|---|---|---|---|
| GPQA Diamond (AA)not in index | 42.4%#468 | 51.5%#421 | Artificial Analysis |
| Humanity's Last Exam (AA)not in index | 5.7%#417 | 6.0%#409 | Artificial Analysis |
| CritPt | 0.0%#315 | 0.0%#315 | Artificial Analysis |
Agents & tools
| Benchmark | no reasoning | thinking | Source |
|---|---|---|---|
| Terminal-Bench Hard | 0.0%#362 | 0.0%#362 | Artificial Analysis |
| τ²-Bench Telecom (AA)not in index | 20.5%#333 | 16.4%#354 | Artificial Analysis |
Knowledge
| Benchmark | no reasoning | thinking | Source |
|---|---|---|---|
| AA-Omniscience | -82.2#544 | -79.8#538 | Artificial Analysis |
| AA-Omniscience: accuracynot in index | 5.0%#542 | 6.8%#529 | Artificial Analysis |
| AA-Omniscience: non-hallucinationnot in index | 8.3%#465 | 7.0%#493 | Artificial Analysis |
Instruction following
| Benchmark | no reasoning | thinking | Source |
|---|---|---|---|
| IFBench | 25.3%#392 | 23.0%#401 | Artificial Analysis |
Long context
| Benchmark | no reasoning | thinking | Source |
|---|---|---|---|
| AA-LCR | 0.0%#493 | 0.0%#493 | Artificial Analysis |
Composite
| Benchmark | no reasoning | thinking | Source |
|---|---|---|---|
| AA Intelligence Index v4.3.2 | 5.2#593 | 5.3#591 | Artificial Analysis |
More from LG AI Research
See also
Questions people ask
- What are Exaone 4.0 1.2B's benchmark scores?
- As of 25 Oct 2026, Exaone 4.0 1.2B (no reasoning effort) scores 37.5 ±4.9 on the BenchLeader Index, strongest in reasoning (41) and weakest in long context (23). That rests on 6 independent benchmark results, and every score on this page links to its publisher.
- How does Exaone 4.0 1.2B rank?
- Exaone 4.0 1.2B (no reasoning effort) is #729 of 785 ranked configurations on 25 Oct 2026. 206 other configurations score within its margin, so the exact position matters less than the band. The leader is Claude Opus 5.5 (max effort) at 72.6.
- When was Exaone 4.0 1.2B released?
- LG AI Research released Exaone 4.0 1.2B on 15 Jul 2025. BenchLeader has results for it at 2 reasoning-effort settings.
Data as of 25 Oct 2026. Compare these configurations.
Cite as: BenchLeader, “Exaone 4.0 1.2B: benchmarks, pricing, speed and rank”, data as of 25 Oct 2026, https://www.benchleader.com/models/exaone-4-0-1-2b.