LLM Comparison
Claude Haiku 5.5 vs Leanstral 1.5
Side-by-side specs, pricing & capabilities
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2/6 models| Organization | ||
| OpenTools Score | ||
| Family | Claude | Leanstral |
| Status | Current | Current |
| Release Date | Oct 2026 | Jun 2026 |
| Context Window | 1.0M tokens | 256K tokens |
| Input Price | $0.10/M tokens | Free |
| Output Price | $0.50/M tokens | Free |
| Pricing Notes | Anthropic Claude API global standard tier, USD per million tokens. Prompts up to 100,000 tokens: $0.10 input, $0.50 output, $0.125 five-minute cache write, $0.20 one-hour cache write, and $0.01 cache read. Prompts above 100,000 tokens: $0.50 input, $2.50 output, $0.625 five-minute cache write, $1 one-hour cache write, and $0.05 cache read. Batch API requests receive a 50% discount. US-only data residency applies a 1.1x token-price multiplier. The Batch API beta supports up to 300,000 output tokens; 128,000 is the standard API cap recorded here. | Mistral model card lists Leanstral 1.5 price as $0. Changelog says the Labs endpoint is scheduled to retire on 2026-09-30. |
| Capabilities | reasoningvisiontool-uselong-contextcontext-caching | textreasoningcodingformal-verificationtool-usestructured-output |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-haiku-5-5 | labs-leanstral-1-5 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.3.2 | 43.4 indexartificial-analysis | — |
| View Claude Haiku 5.5 | View Leanstral 1.5 | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Leanstral 1.5Cheapest | $0.00 | $0.00 | $0.00 | — |
| Claude Haiku 5.5 | $0.10 | $0.25 | $0.35 | +0% |
Anthropic
Claude Haiku 5.5
Claude Haiku 5.5 is Anthropic's fast proprietary model for high-volume classification, extraction, routing, and subagent workloads. It accepts text and images, returns text, uses adaptive thinking, and supports a 1,000,000-token context window with up to 128,000 output tokens on standard API calls.
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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