Claude Haiku 5.5 vs Laguna S 2.1: Specs & Benchmark Comparison
Claude Haiku 5.5 is developed by Anthropic, while Laguna S 2.1 comes from Poolside. Laguna S 2.1 was released in July 2026, and Claude Haiku 5.5 followed 3 months later in October 2026. Laguna S 2.1 has a published size of about 118 billion parameters; Anthropic has not disclosed the parameter count of Claude Haiku 5.5.
The two models share 2 published benchmarks. Claude Haiku 5.5 leads on 2 of them. The widest gaps are on SWE-Bench Pro, where Claude Haiku 5.5 scores 64.8% against 59.4%; SWE-bench Multilingual, where Claude Haiku 5.5 scores 83.7% against 78.5%. Averaged across everything we track, Claude Haiku 5.5 sits at 57.7% and Laguna S 2.1 at 57.4%.
On price the two are close: Claude Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens, Laguna S 2.1 $0.10 and $0.20. Both accept a context window of about 1M tokens. Claude Haiku 5.5 accepts text and images as input, while Laguna S 2.1 accepts text. On tooling, only Claude Haiku 5.5 supports function calling and only Claude Haiku 5.5 offers structured output.
| Characteristic | Claude Haiku 5.5 | Laguna S 2.1 |
|---|---|---|
| Company | Anthropic | Poolside |
| Release Date | October 7, 2026 | July 21, 2026 |
| Parameters | — | 118B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | — |
| Input Price / 1M | $0.10 | $0.10 |
| Output Price / 1M | $0.50 | $0.20 |
| Average Score | 57.7% | 57.4% |
| Benchmarks | ||
| SWE-Bench Pro | 64.8% | 59.4% |
| SWE-bench Multilingual | 83.7% | 78.5% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Claude Haiku 5.5 — 0.6, Laguna S 2.1 — 0.6.
Laguna S 2.1 is 2.0x cheaper: input $0.10/1M vs $0.10/1M tokens.
Same context size: 1M tokens.
Claude Haiku 5.5 is newer: released 10/7/2026 vs 7/21/2026.
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Frequently Asked Questions
Which is better for coding — Claude Haiku 5.5 or Laguna S 2.1?
Which model is cheaper — Claude Haiku 5.5 or Laguna S 2.1?
Which has a larger context window — Claude Haiku 5.5 or Laguna S 2.1?
The Claude Haiku 5.5 and Laguna S 2.1 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Haiku 5.5 or Laguna S 2.1 page. See also the complete list of AI model comparisons.