Claude Haiku 5.5 vs Claude Opus 5.5
Claude Opus 5.5 leads the LLM Stats Score 60.5 to 50.3. Claude Haiku 5.5 is 40.0x cheaper per token.
Anthropic · Anthropic · Updated for 2026
Which is better?
Claude Opus 5.5 leads the overall LLM Stats Score 60.5 to 50.3, ranking #1 overall.
In the 22 individual benchmarks reported for both models, Claude Opus 5.5 wins 21; this is a narrower head-to-head signal than the composite indexes.
On price, Claude Haiku 5.5 is roughly 40.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Haiku 5.5
- cost matters — it's about 40.0x cheaper per token
- you want the most recent training data — it shipped Oct 2026
Choose Claude Opus 5.5
- overall performance matters — it scores 60.5 and ranks #1 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 21 of 22 exact shared results
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
36 reported for Claude Haiku 5.5 · 31 for Claude Opus 5.5
Claude Haiku 5.5 outperforms in 1 benchmarks (HealthBench), while Claude Opus 5.5 is better at 21 benchmarks (AA-Briefcase v1.1, BenchCAD, BenchCAD (with Python tool), Chartography, FrontierCode 1.1, FrontierSWE V2, GDPval-AA 2.1, Global-MMLU, HealthBench Professional, Humanity's Last Exam (no tools, text-only), LatchBio SingleCellBench, LatchBio SpatialBench Verified, MILU, OfficeQA, OfficeQA Pro, Program Bench, SWE-bench Multilingual, SWE-Bench Multimodal, SWE-Bench Pro, Terminal-Bench 4.0, Terminal-Bench-Science 0.1).
Claude Opus 5.5 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Haiku 5.5 ($0.10/1M tokens) is 40.0x cheaper than Claude Opus 5.5 ($4.00/1M tokens).
For output processing, Claude Haiku 5.5 ($0.50/1M tokens) is 40.0x cheaper than Claude Opus 5.5 ($20.00/1M tokens).
In conclusion, Claude Opus 5.5 is more expensive than Claude Haiku 5.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,000,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Haiku 5.5 and Claude Opus 5.5 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Haiku 5.5
Claude Opus 5.5
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Haiku 5.5 was released on 2026-10-07, while Claude Opus 5.5 was released on 2026-09-22.
Claude Haiku 5.5 is 1 month newer than Claude Opus 5.5.
Oct 7, 2026
0 days ago
2w newerSep 22, 2026
2 weeks ago
Knowledge Cutoff
When training data ends
Both models have the same knowledge cutoff date of 2026-06-01.
They should have similar awareness of historical events and information up to this date.
Jun 2026
Jun 2026
Provider Availability
Claude Haiku 5.5 is available from Anthropic. Claude Opus 5.5 is available from Anthropic.
Claude Haiku 5.5
Claude Opus 5.5
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Haiku 5.5 and Claude Opus 5.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Haiku 5.5 vs Claude Opus 5.5.