LLM Comparison
Cactus Needle 2 vs Leanstral 1.5
Side-by-side specs, pricing & capabilities · Updated August 2026
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2/6 models| Organization | ||
| OpenTools Score | ||
| Family | Needle | Leanstral |
| Status | Current | Current |
| Release Date | Aug 2026 | Jun 2026 |
| Context Window | 256 tokens | 256K tokens |
| Input Price | Free | Free |
| Output Price | Free | Free |
| Pricing Notes | Apache 2.0 model artifact; runtime cost depends on local hardware, not token API pricing. | Mistral model card lists Leanstral 1.5 price as $0. Changelog says the Labs endpoint is scheduled to retire on 2026-09-30. |
| Capabilities | tool-usestructured-outputjson-schemadevice-controledge-inferenceoffline | textreasoningcodingformal-verificationtool-usestructured-output |
| Max Output | 256 tokens | 128K tokens |
| API Identifier | Cactus-Compute/needle2 | labs-leanstral-1-5 |
| Benchmarks | ||
| Mobile Actions Ordered Strict Exact Match | 63.7cactus-compute | — |
| BFCL v4 Single-Turn Overall | 42.6cactus-compute | — |
| miniF2F | — | 100mistral |
| PutnamBench | — | 587mistral |
| FLTEval pass@8 | — | 43.2mistral |
| View Cactus Needle 2 | View Leanstral 1.5 | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Cactus Needle 2Cheapest | $0.00 | $0.00 | $0.00 | — |
| Leanstral 1.5Cheapest | $0.00 | $0.00 | $0.00 | — |
Cactus Compute
Cactus Needle 2
Cactus Needle 2 is a 45M-parameter, 14 MB agentic model for tiny devices. It focuses on tool calling, device control, schema-constrained JSON, and structured extraction; Cactus reports 28 MB session RAM, 800+ tok/s prefill, and 500+ tok/s decode on Raspberry Pi 5.
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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