Claude Haiku 5.5 vs Claude Opus 5.5: Specs & Benchmark Comparison
Claude Haiku 5.5 and Claude Opus 5.5 both come from Anthropic, Claude Opus 5.5 was released in September 2026, and Claude Haiku 5.5 followed a month later in October 2026.
The two models share 22 published benchmarks. Claude Opus 5.5 leads on 21 of them, Claude Haiku 5.5 on 1. The widest gaps are on Terminal-Bench-Science 0.1, where Claude Opus 5.5 scores 58.7% against 20.6%; SWE-Bench Multimodal, where Claude Opus 5.5 scores 61.4% against 30.7%. Averaged across everything we track, Claude Haiku 5.5 sits at 57.7% and Claude Opus 5.5 at 71.1%.
Claude Haiku 5.5 is the cheaper API at $0.10 per million input tokens and $0.50 per million output tokens, roughly 40 times cheaper than Claude Opus 5.5 at $4 and $20. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | Claude Haiku 5.5 | Claude Opus 5.5 |
|---|---|---|
| Company | Anthropic | Anthropic |
| Release Date | October 7, 2026 | September 22, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $0.10 | $4.00 |
| Output Price / 1M | $0.50 | $20.00 |
| Average Score | 57.7% | 71.1% |
| Benchmarks | ||
| Terminal-Bench-Science 0.1 | 20.6% | 58.7% |
| SWE-Bench Multimodal | 30.7% | 61.4% |
| Terminal-Bench 4.0 | 39.2% | 66.4% |
| SWE-Bench Pro | 64.8% | 89.9% |
| FrontierSWE V2 | 43.8% | 62.3% |
| Humanity's Last Exam (no tools, text-only) | 45.9% | 64.4% |
| SWE-bench Multilingual | 83.7% | 93.9% |
| Program Bench | 82.0% | 91.2% |
| BenchCAD (with Python tool) | 87.0% | 96.2% |
| AA-Briefcase v1.1 | 52.6% | 60.7% |
| FrontierCode 1.1 | 46.4% | 54.4% |
| GDPval-AA 2.1 | 54.0% | 61.5% |
| OfficeQA Pro | 60.3% | 67.7% |
| Global-MMLU | 87.8% | 94.3% |
| BenchCAD | 67.0% | 73.0% |
| MILU | 87.6% | 93.1% |
| OfficeQA | 73.5% | 78.9% |
| LatchBio SingleCellBench | 56.2% | 61.2% |
| LatchBio SpatialBench Verified | 67.7% | 72.0% |
| Chartography | 86.2% | 89.0% |
| HealthBench | 61.6% | 60.6% |
| HealthBench Professional | 64.8% | 65.6% |
Visual Benchmark Comparison
Verdict
Claude Haiku 5.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Haiku 5.5 — 0.6, Claude Opus 5.5 — 0.7.
Claude Haiku 5.5 is 40.0x cheaper: input $0.10/1M vs $4.00/1M tokens.
Same context size: 1M tokens.
Claude Haiku 5.5 is newer: released 10/7/2026 vs 9/22/2026.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — Claude Haiku 5.5 or Claude Opus 5.5?
Which model is cheaper — Claude Haiku 5.5 or Claude Opus 5.5?
Which has a larger context window — Claude Haiku 5.5 or Claude Opus 5.5?
The Claude Haiku 5.5 and Claude Opus 5.5 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 Claude Opus 5.5 page. See also the complete list of AI model comparisons.