LLM Comparison
Hermes 4 70B vs Leanstral 1.5
Side-by-side specs, pricing & capabilities · Updated August 2026
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | ||
| Family | Hermes | Leanstral |
| Status | Current | Current |
| Release Date | Aug 2025 | Jun 2026 |
| Context Window | 131K tokens | 256K tokens |
| Input Price | $0.13/M tokens | Free |
| Output Price | $0.40/M tokens | Free |
| Pricing Notes | — | Mistral model card lists Leanstral 1.5 price as $0. Changelog says the Labs endpoint is scheduled to retire on 2026-09-30. |
| Capabilities | textcode | textreasoningcodingformal-verificationtool-usestructured-output |
| Max Output | — | 128K tokens |
| API Identifier | nousresearch/hermes-4-70b | labs-leanstral-1-5 |
| Benchmarks | ||
| miniF2F | — | 100mistral |
| PutnamBench | — | 587mistral |
| FLTEval pass@8 | — | 43.2mistral |
| View Hermes 4 70B | View Leanstral 1.5 | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Leanstral 1.5Cheapest | $0.00 | $0.00 | $0.00 | — |
| Hermes 4 70B | $0.13 | $0.20 | $0.33 | +0% |
Nous Research
Hermes 4 70B
Hermes 4 70B is a large language model from Nous Research. Supports up to 131,072 token context window. Available from $0.13/M input tokens.
Mistral AI
Leanstral 1.5
Leanstral 1.5 is Mistral AI free Lean 4 formal proof-engineering model for automated theorem proving, autoformalization, and real-world code verification. Official Mistral docs list it as a Labs model with 119B total parameters, 6.5B active parameters, a 256k context window, 128k max output, $0 pricing, and the labs-leanstral-1-5 API identifier.
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