LLM Comparison
DeepSeek V4 Flash 0731 vs Leanstral 1.5
Side-by-side specs, pricing & capabilities · Updated August 2026
Add to comparison
2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 46 219 | |
| Family | DeepSeek V4 Flash | Leanstral |
| Status | Current | Current |
| Release Date | Jul 2026 | Jun 2026 |
| Context Window | 1.0M tokens | 256K tokens |
| Input Price | $0.14/M tokens | Free |
| Output Price | $0.28/M tokens | Free |
| Pricing Notes | DeepSeek API pricing lists $0.0028 cache-hit input, $0.14 cache-miss input, and $0.28 output per 1M tokens for deepseek-v4-flash; peak pricing may change after a future official announcement. | Mistral model card lists Leanstral 1.5 price as $0. Changelog says the Labs endpoint is scheduled to retire on 2026-09-30. |
| Capabilities | reasoningcodingtool-usestructured-outputlong-contextresponses-api | textreasoningcodingformal-verificationtool-usestructured-output |
| Max Output | 393K tokens | 128K tokens |
| API Identifier | deepseek-v4-flash | labs-leanstral-1-5 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.1 | 50artificial-analysis | — |
| Artificial Analysis Intelligence Index v4.1.1 | 52artificial-analysis | — |
| miniF2F | — | 100mistral |
| PutnamBench | — | 587mistral |
| FLTEval pass@8 | — | 43.2mistral |
| View DeepSeek V4 Flash 0731 | 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 | — |
| DeepSeek V4 Flash 0731 | $0.14 | $0.14 | $0.28 | +0% |
DeepSeek
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 is an open-weight, cost-efficient reasoning model for long-context coding, agent tasks, and API workflows through DeepSeek.
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.
More Comparisons
Looking for more AI models?
Browse All LLMs