Claude Haiku 4.5 vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
o3 by OpenAI wins on 9 of 15 benchmarks against Claude Haiku 4.5 by Anthropic, which leads on 5. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, o3 scores 1380 on Chatbot Arena ELO compared to Claude Haiku 4.5's 1220, while o3 scores 84.0% on MMLU-Pro compared to Claude Haiku 4.5's 65.0%.
Coding: In coding, o3 scores 90.0% on HumanEval+ compared to Claude Haiku 4.5's 78.0%, while o3 scores 69.1% on SWE-bench Verified compared to Claude Haiku 4.5's 30.0%, while o3 scores 70.0% on LiveCodeBench compared to Claude Haiku 4.5's 35.0%.
Math: In math, o3 scores 96.0% on MATH compared to Claude Haiku 4.5's 70.0%, while o3 scores 98.5% on GSM8K compared to Claude Haiku 4.5's 88.0%.
Reasoning: In reasoning, o3 scores 83.3% on GPQA Diamond compared to Claude Haiku 4.5's 40.0%, while o3 scores 75.7% on ARC-AGI compared to Claude Haiku 4.5's 18.0%.
Context: In context, both score 200K on Context Length.
Pricing Comparison
Claude Haiku 4.5 costs $1.0/1M input tokens and $5.0/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. Claude Haiku 4.5 is the more affordable option for API usage.
Speed Comparison
Claude Haiku 4.5 generates output at 180 tok/s compared to o3's 40 tok/s, and the time to first token is 120 ms for Claude Haiku 4.5 versus 800 ms for o3. Claude Haiku 4.5 delivers faster throughput.
Verdict
For developers prioritizing affordability and speed, Claude Haiku 4.5 has the edge. For those who value coding and general intelligence and math, o3 is the stronger choice.
View Individual Model Pages
Claude Haiku 4.5 vs o3 — FAQ
Which is better, Claude Haiku 4.5 or o3?
o3 wins on more benchmarks overall (9 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Haiku 4.5 compare to o3 for coding?
o3 is better for coding, scoring 69.1% on SWE-bench Verified compared to 30.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Haiku 4.5 cheaper than o3?
Yes, Claude Haiku 4.5 is cheaper. Claude Haiku 4.5 costs $1.0/1M input and $5.0/1M output tokens. o3 costs $2.0/1M input and $8.0/1M output tokens.
Which is faster, Claude Haiku 4.5 or o3?
Claude Haiku 4.5 is faster, generating output at 180 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Haiku 4.5 vs o3 comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, LiveCodeBench, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.