Model Comparison

Claude Haiku 4.5 vs o3

Both models are evenly matched across the benchmarks. Claude Haiku 4.5 is 1.8x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Claude Haiku 4.5 outperforms in 3 benchmarks (SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while o3 is better at 3 benchmarks (AIME 2025, GPQA, Tau2 Airline).

Both models are evenly matched across the benchmarks.

Sun May 10 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Haiku 4.5 costs less

For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 2.0x cheaper than o3 ($2.00/1M tokens).

For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 1.6x cheaper than o3 ($8.00/1M tokens).

In conclusion, o3 is more expensive than Claude Haiku 4.5.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun May 10 2026 • llm-stats.com
Anthropic
Claude Haiku 4.5
Input tokens$1.00
Output tokens$5.00
Best providerAnthropic
OpenAI
o3
Input tokens$2.00
Output tokens$8.00
Best providerOpenAI
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Context Window

Maximum input and output token capacity

Both models have the same input context window of 200,000 tokens. o3 can generate longer responses up to 100,000 tokens, while Claude Haiku 4.5 is limited to 64,000 tokens.

Anthropic
Claude Haiku 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
o3
Input200,000 tokens
Output100,000 tokens
Sun May 10 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Haiku 4.5 and o3 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Haiku 4.5

Text
Images
Audio
Video

o3

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Haiku 4.5

Proprietary

Closed source

o3

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Haiku 4.5 was released on 2025-10-15, while o3 was released on 2025-04-16.

Claude Haiku 4.5 is 6 months newer than o3.

Claude Haiku 4.5

Oct 15, 2025

6 months ago

6mo newer
o3

Apr 16, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Claude Haiku 4.5 has a knowledge cutoff of 2025-02-01, while o3 has a cutoff of 2024-05-31.

Claude Haiku 4.5 has more recent training data (up to 2025-02-01), making it potentially better informed about events through that date compared to o3 (2024-05-31).

Claude Haiku 4.5

Feb 2025

9 mo newer
o3

May 2024

Provider Availability

Claude Haiku 4.5 is available from Anthropic. o3 is available from OpenAI.

Claude Haiku 4.5

anthropic logo
Anthropic
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M

o3

openai logo
OpenAI
Input Price:Input: $2.00/1MOutput Price:Output: $8.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Less expensive input tokens
Less expensive output tokens
Higher SWE-Bench Verified score (73.3% vs 69.1%)
Higher Tau2 Retail score (83.2% vs 80.2%)
Higher Tau2 Telecom score (83.0% vs 58.2%)
OpenAI
Higher AIME 2025 score (86.4% vs 80.7%)
Higher GPQA score (83.3% vs 73.0%)
Higher Tau2 Airline score (64.8% vs 63.6%)
AnthropicClaude Haiku 4.5
OpenAIo3
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Haiku 4.5
OpenAI
o3

FAQ

Common questions about Claude Haiku 4.5 vs o3.

Which is better, Claude Haiku 4.5 or o3?

Both models are evenly matched across the benchmarks. Claude Haiku 4.5 is made by Anthropic and o3 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Haiku 4.5 compare to o3 in benchmarks?

Claude Haiku 4.5 scores Tau2 Retail: 83.2%, MMMLU: 83.0%, Tau2 Telecom: 83.0%, AIME 2025: 80.7%, SWE-Bench Verified: 73.3%. o3 scores COLLIE: 98.4%, AIME 2024: 91.6%, ARC-AGI: 88.0%, MathVista: 86.8%, AIME 2025: 86.4%.

Is Claude Haiku 4.5 cheaper than o3?

Claude Haiku 4.5 is 2.0x cheaper for input tokens. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output via anthropic. o3 costs $2.00/M input and $8.00/M output via openai.

What are the context window sizes for Claude Haiku 4.5 and o3?

Claude Haiku 4.5 supports 200K tokens and o3 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Haiku 4.5 and o3?

Key differences include input pricing ($1.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 4.5 and o3?

Claude Haiku 4.5 is developed by Anthropic and o3 is developed by OpenAI.