Claude Haiku 5.5 vs Claude Sonnet 5
Claude Haiku 5.5 and Claude Sonnet 5 are closely matched at 50.1 and 47.3 on the LLM Stats Score. Claude Haiku 5.5 is 20.0x cheaper per token.
Anthropic · Anthropic · Updated for 2026
Which is better?
Claude Haiku 5.5 and Claude Sonnet 5 are closely matched on the overall LLM Stats Score at 50.1 and 47.3.
In the 8 individual benchmarks reported for both models, Claude Haiku 5.5 wins 8; this is a narrower head-to-head signal than the composite indexes.
On price, Claude Haiku 5.5 is roughly 20.0x 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
- you value its reported benchmark strengths — it wins 8 of 8 exact shared results
- cost matters — it's about 20.0x cheaper per token
- you want the most recent training data — it shipped Oct 2026
Choose Claude Sonnet 5
- you want predictable pricing at $2.00/M input and $10.00/M output
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 · 23 for Claude Sonnet 5
Claude Haiku 5.5 outperforms in 8 benchmarks (BenchCAD, FrontierCode 1.1, HealthBench Professional, OfficeQA Pro, SWE-bench Multilingual, SWE-Bench Multimodal, SWE-Bench Pro, Terminal-Bench 4.0), while Claude Sonnet 5 is better at 0 benchmarks.
Claude Haiku 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 20.0x cheaper than Claude Sonnet 5 ($2.00/1M tokens).
For output processing, Claude Haiku 5.5 ($0.50/1M tokens) is 20.0x cheaper than Claude Sonnet 5 ($10.00/1M tokens).
In conclusion, Claude Sonnet 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. Claude Haiku 5.5 can generate longer responses up to 128,000 tokens, while Claude Sonnet 5 is limited to 64,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Haiku 5.5 and Claude Sonnet 5 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Haiku 5.5
Claude Sonnet 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 Sonnet 5 was released on 2026-06-30.
Claude Haiku 5.5 is 3 months newer than Claude Sonnet 5.
Oct 7, 2026
5 days ago
3mo newerJun 30, 2026
3 months ago
Knowledge Cutoff
When training data ends
Claude Haiku 5.5 has a documented knowledge cutoff of 2026-06-01, while Claude Sonnet 5's cutoff date is not specified.
We can confirm Claude Haiku 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Claude Sonnet 5's cutoff date.
Jun 2026
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Provider Availability
Claude Haiku 5.5 is available from Anthropic. Claude Sonnet 5 is available from Anthropic, DeepInfra.
Claude Haiku 5.5
Claude Sonnet 5
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Haiku 5.5 and Claude Sonnet 5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Haiku 5.5 vs Claude Sonnet 5.