Claude Haiku 5.5 vs o3-pro
Comparing Claude Haiku 5.5 and o3-pro across benchmarks, pricing, and capabilities.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Haiku 5.5 and o3-pro trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, Claude Haiku 5.5 is roughly 175.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Haiku 5.5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Haiku 5.5
- cost matters — it's about 175.0x cheaper per token
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Oct 2026
Choose o3-pro
- you want predictable pricing at $20.00/M input and $80.00/M output
At a glance
The differences that matter most.
Individual benchmarks
36 reported for Claude Haiku 5.5 · 0 for o3-pro
Claude Haiku 5.5 and o3-prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
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 200.0x cheaper than o3-pro ($20.00/1M tokens).
For output processing, Claude Haiku 5.5 ($0.50/1M tokens) is 160.0x cheaper than o3-pro ($80.00/1M tokens).
In conclusion, o3-pro 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
Claude Haiku 5.5 accepts 1,000,000 input tokens compared to o3-pro's 200,000 tokens. Claude Haiku 5.5 can generate longer responses up to 128,000 tokens, while o3-pro is limited to 100,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Haiku 5.5 and o3-pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Haiku 5.5
o3-pro
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 o3-pro was released on 2025-06-10.
Claude Haiku 5.5 is 16 months newer than o3-pro.
Oct 7, 2026
1 weeks ago
1.3yr newerJun 10, 2025
1.4 years ago
Knowledge Cutoff
When training data ends
Claude Haiku 5.5 has a knowledge cutoff of 2026-06-01, while o3-pro has a cutoff of 2024-05-31.
Claude Haiku 5.5 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to o3-pro (2024-05-31).
Jun 2026
2.1 yr newerMay 2024
Provider Availability
Claude Haiku 5.5 is available from Anthropic. o3-pro is available from OpenAI.
Claude Haiku 5.5
o3-pro
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Haiku 5.5 and o3-pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Haiku 5.5 vs o3-pro.