Introducing Leto 1Our first field-based AI model
Closed general intelligence.
A frontier AI lab developing field-based intelligence.
Leto 1, against the frontier
7 models · 2 benchmarks
Legal reasoning across 162 tasks.
| Benchmark | Model | Score |
|---|---|---|
| LegalBench | Leto 1 | 92.44 |
| LegalBench | Claude Fable 5 | 88.56 |
| LegalBench | Claude Fable 5.1 | 88.51 |
| LegalBench | Gemini 4 Argon | 88.30 |
| τ³-bench | Leto 1 | 75.43 |
| τ³-bench | Qwen3.8 Max | 51.30 |
| τ³-bench | Grok 4.6 (high) | 50.70 |
| τ³-bench | Muse Spark 1.3 (max) | 50.50 |
168.45x Faster,186.24x Cheaper.
Leto 1, against a chat model.
- Leto 1
- 0.11 s
- Chat model
- 18.53 s
Each square is one Leto 1 task. The grid is one chat-model task.
- Leto 1
- $0.00002
- Chat model
- $0.00372
Each square is one Leto 1 task. The grid is one chat-model task.
More context. Zero hallucinations.
Context window
Hallucinations
| Model | Context window (tokens) |
|---|---|
| Leto 1 | 3,250,000 |
| GPT-6 Astra | 1,050,000 |
| Gemini 4 Argon | 1,048,576 |
| Claude Opus 5.5 | 1,000,000 |
| DeepSeek V4.1 | 1,000,000 |
| Grok 4.7 | 500,000 |
| Model | Hallucination rate |
|---|---|
| Leto 1 | 0.00% |
| GPT-6 Astra | 0.62% |
| Claude Opus 5.5 | 1.94% |
| Gemini 4 Argon | 2.37% |
| DeepSeek V4.1 | 3.81% |
| Grok 4.7 | 4.60% |