Model Comparison

Claude Haiku 4.5 vs GPT-4.5

Claude Haiku 4.5 shows notably better performance in the majority of benchmarks. Claude Haiku 4.5 is 46.9x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Claude Haiku 4.5 outperforms in 2 benchmarks (GPQA, SWE-Bench Verified), while GPT-4.5 is better at 1 benchmark (MMMLU).

Claude Haiku 4.5 shows notably better performance in the majority of 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 75.0x cheaper than GPT-4.5 ($75.00/1M tokens).

For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 30.0x cheaper than GPT-4.5 ($150.00/1M tokens).

In conclusion, GPT-4.5 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
GPT-4.5
Input tokens$75.00
Output tokens$150.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Haiku 4.5 accepts 200,000 input tokens compared to GPT-4.5's 128,000 tokens. Claude Haiku 4.5 can generate longer responses up to 64,000 tokens, while GPT-4.5 is limited to 4,096 tokens.

Anthropic
Claude Haiku 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
Sun May 10 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Haiku 4.5 and GPT-4.5 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

GPT-4.5

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

GPT-4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Haiku 4.5 was released on 2025-10-15, while GPT-4.5 was released on 2025-02-27.

Claude Haiku 4.5 is 8 months newer than GPT-4.5.

Claude Haiku 4.5

Oct 15, 2025

6 months ago

7mo newer
GPT-4.5

Feb 27, 2025

1.2 years ago

Knowledge Cutoff

When training data ends

Claude Haiku 4.5 has a documented knowledge cutoff of 2025-02-01, while GPT-4.5's cutoff date is not specified.

We can confirm Claude Haiku 4.5's training data extends to 2025-02-01, but cannot make a direct comparison without GPT-4.5's cutoff date.

Claude Haiku 4.5

Feb 2025

GPT-4.5

—

Provider Availability

Claude Haiku 4.5 is available from Anthropic. GPT-4.5 is available from OpenAI.

Claude Haiku 4.5

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

GPT-4.5

openai logo
OpenAI
Input Price:Input: $75.00/1MOutput Price:Output: $150.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher GPQA score (73.0% vs 69.5%)
Higher SWE-Bench Verified score (73.3% vs 38.0%)
OpenAI
Higher MMMLU score (85.1% vs 83.0%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Haiku 4.5
OpenAI
GPT-4.5

FAQ

Common questions about Claude Haiku 4.5 vs GPT-4.5.

Which is better, Claude Haiku 4.5 or GPT-4.5?

Claude Haiku 4.5 shows notably better performance in the majority of benchmarks. Claude Haiku 4.5 is made by Anthropic and GPT-4.5 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 GPT-4.5 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%. GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%.

Is Claude Haiku 4.5 cheaper than GPT-4.5?

Claude Haiku 4.5 is 75.0x cheaper for input tokens. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output via anthropic. GPT-4.5 costs $75.00/M input and $150.00/M output via openai.

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

Claude Haiku 4.5 supports 200K tokens and GPT-4.5 supports 128K 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 GPT-4.5?

Key differences include context window (200K vs 128K), input pricing ($1.00 vs $75.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 4.5 and GPT-4.5?

Claude Haiku 4.5 is developed by Anthropic and GPT-4.5 is developed by OpenAI.