Model Comparison

Claude Haiku 4.5 vs GPT-5 miniWhich is better in 2026?

GPT-5 mini significantly outperforms across most benchmarks. GPT-5 mini is 2.9x cheaper per token.

Verdict: Claude Haiku 4.5 vs GPT-5 mini — which is better?

Claude Haiku 4.5 (by Anthropic) and GPT-5 mini (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Haiku 4.5 outperforms in 0 benchmarks, while GPT-5 mini is better at 2 benchmarks (AIME 2025, GPQA). GPT-5 mini significantly outperforms across most benchmarks.

On price, GPT-5 mini is roughly 2.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5 mini also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Haiku 4.5 if…

  • you want the most recent training data — it shipped Oct 2025

Choose GPT-5 mini if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • cost matters — it's about 2.9x cheaper per token
  • you process long inputs — it offers a 400,000 token context window

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Claude Haiku 4.5 outperforms in 0 benchmarks, while GPT-5 mini is better at 2 benchmarks (AIME 2025, GPQA).

GPT-5 mini significantly outperforms across most benchmarks.

Fri Jul 03 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5 mini costs less

For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 4.0x more expensive than GPT-5 mini ($0.25/1M tokens).

For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 2.5x more expensive than GPT-5 mini ($2.00/1M tokens).

In conclusion, Claude Haiku 4.5 is more expensive than GPT-5 mini.*

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

Lowest available price from all providers
Fri Jul 03 2026 • llm-stats.com
Anthropic
Claude Haiku 4.5
Input tokens$1.00
Output tokens$5.00
Best providerAnthropic
OpenAI
GPT-5 mini
Input tokens$0.25
Output tokens$2.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5 mini accepts 400,000 input tokens compared to Claude Haiku 4.5's 200,000 tokens. GPT-5 mini can generate longer responses up to 128,000 tokens, while Claude Haiku 4.5 is limited to 64,000 tokens.

Anthropic
Claude Haiku 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-5 mini
Input400,000 tokens
Output128,000 tokens
Fri Jul 03 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Haiku 4.5 and GPT-5 mini 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-5 mini

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-5 mini

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Haiku 4.5 was released on 2025-10-15, while GPT-5 mini was released on 2025-08-07.

Claude Haiku 4.5 is 2 months newer than GPT-5 mini.

Claude Haiku 4.5

Oct 15, 2025

8 months ago

2mo newer
GPT-5 mini

Aug 7, 2025

11 months ago

Knowledge Cutoff

When training data ends

Claude Haiku 4.5 has a knowledge cutoff of 2025-02-01, while GPT-5 mini has a cutoff of 2024-05-30.

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 GPT-5 mini (2024-05-30).

Claude Haiku 4.5

Feb 2025

9 mo newer
GPT-5 mini

May 2024

Provider Availability

Claude Haiku 4.5 is available from Anthropic, Vertex AI. GPT-5 mini is available from OpenAI.

Claude Haiku 4.5

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

GPT-5 mini

openai logo
OpenAI
Input Price:Input: $0.25/1MOutput Price:Output: $2.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic

No standout differentiators in the data we have for this pair.

OpenAI
Larger context window (400,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher AIME 2025 score (91.1% vs 80.7%)
Higher GPQA score (82.3% vs 73.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Haiku 4.5 and GPT-5 mini side-by-side, then vote on the output you prefer.

Claude Haiku 4.5
✓ Preferred
GPT-5 mini
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Haiku 4.5
OpenAI
GPT-5 mini

FAQ

Common questions about Claude Haiku 4.5 vs GPT-5 mini.

Which is better, Claude Haiku 4.5 or GPT-5 mini?

GPT-5 mini significantly outperforms across most benchmarks. Claude Haiku 4.5 is made by Anthropic and GPT-5 mini 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-5 mini 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-5 mini scores AIME 2025: 91.1%, HMMT 2025: 87.8%, GPQA: 82.3%, FrontierMath: 22.1%, Humanity's Last Exam: 16.7%.

Is Claude Haiku 4.5 cheaper than GPT-5 mini?

GPT-5 mini is 4.0x cheaper for input tokens. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output via anthropic. GPT-5 mini costs $0.25/M input and $2.00/M output via openai.

What are the context window sizes for Claude Haiku 4.5 and GPT-5 mini?

Claude Haiku 4.5 supports 200K tokens and GPT-5 mini supports 400K 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-5 mini?

Key differences include context window (200K vs 400K), input pricing ($1.00 vs $0.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 4.5 and GPT-5 mini?

Claude Haiku 4.5 is developed by Anthropic and GPT-5 mini is developed by OpenAI.

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