Model Comparison

Claude Haiku 4.5 vs GPT OSS 120B HighWhich is better in 2026?

GPT OSS 120B High significantly outperforms across most benchmarks. GPT OSS 120B High is 10.0x cheaper per token.

Verdict: Claude Haiku 4.5 vs GPT OSS 120B High — which is better?

Claude Haiku 4.5 (by Anthropic) and GPT OSS 120B High (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 OSS 120B High is better at 3 benchmarks (AIME 2025, GPQA, MMMLU). GPT OSS 120B High significantly outperforms across most benchmarks.

On price, GPT OSS 120B High is roughly 10.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Haiku 4.5 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Haiku 4.5 if…

  • you process long inputs — it offers a 200,000 token context window
  • you want the most recent training data — it shipped Oct 2025

Choose GPT OSS 120B High if…

  • you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
  • cost matters — it's about 10.0x cheaper per token
  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Claude Haiku 4.5 outperforms in 0 benchmarks, while GPT OSS 120B High is better at 3 benchmarks (AIME 2025, GPQA, MMMLU).

GPT OSS 120B High significantly outperforms across most benchmarks.

Mon Jul 20 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 120B High costs less

For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 10.0x more expensive than GPT OSS 120B High ($0.10/1M tokens).

For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 10.0x more expensive than GPT OSS 120B High ($0.50/1M tokens).

In conclusion, Claude Haiku 4.5 is more expensive than GPT OSS 120B High.*

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

Lowest available price from all providers
Mon Jul 20 2026 • llm-stats.com
Anthropic
Claude Haiku 4.5
Input tokens$1.00
Output tokens$5.00
Best providerAnthropic
OpenAI
GPT OSS 120B High
Input tokens$0.10
Output tokens$0.50
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 OSS 120B High's 131,072 tokens. GPT OSS 120B High can generate longer responses up to 131,072 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 OSS 120B High
Input131,072 tokens
Output131,072 tokens
Mon Jul 20 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Haiku 4.5 supports multimodal inputs, whereas GPT OSS 120B High does not.

Claude Haiku 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Haiku 4.5

Text
Images
Audio
Video

GPT OSS 120B High

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Haiku 4.5 is licensed under a proprietary license, while GPT OSS 120B High uses Apache 2.0.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Haiku 4.5

Proprietary

Closed source

GPT OSS 120B High

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Haiku 4.5 was released on 2025-10-15, while GPT OSS 120B High was released on 2025-08-05.

Claude Haiku 4.5 is 2 months newer than GPT OSS 120B High.

Claude Haiku 4.5

Oct 15, 2025

9 months ago

2mo newer
GPT OSS 120B High

Aug 5, 2025

11 months ago

Knowledge Cutoff

When training data ends

Claude Haiku 4.5 has a documented knowledge cutoff of 2025-02-01, while GPT OSS 120B High'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 OSS 120B High's cutoff date.

Claude Haiku 4.5

Feb 2025

GPT OSS 120B High

—

Provider Availability

Claude Haiku 4.5 is available from Anthropic, Vertex AI. GPT OSS 120B High is available from OpenAI, Fireworks.

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 OSS 120B High

openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
fireworks logo
Fireworks
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher AIME 2025 score (92.5% vs 80.7%)
Higher GPQA score (80.9% vs 73.0%)
Higher MMMLU score (83.8% vs 83.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Haiku 4.5 and GPT OSS 120B High side-by-side, then vote on the output you prefer.

Claude Haiku 4.5
✓ Preferred
GPT OSS 120B High
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Haiku 4.5
OpenAI
GPT OSS 120B High

FAQ

Common questions about Claude Haiku 4.5 vs GPT OSS 120B High.

Which is better, Claude Haiku 4.5 or GPT OSS 120B High?

GPT OSS 120B High significantly outperforms across most benchmarks. Claude Haiku 4.5 is made by Anthropic and GPT OSS 120B High 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 OSS 120B High 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 OSS 120B High scores AIME 2025: 92.5%, MMMLU: 83.8%, LiveCodeBench v6: 81.9%, GPQA: 80.9%, MMLU-Pro: 80.7%.

Is Claude Haiku 4.5 cheaper than GPT OSS 120B High?

GPT OSS 120B High is 10.0x cheaper for input tokens. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output via anthropic. GPT OSS 120B High costs $0.10/M input and $0.50/M output via openai.

What are the context window sizes for Claude Haiku 4.5 and GPT OSS 120B High?

Claude Haiku 4.5 supports 200K tokens and GPT OSS 120B High supports 131K 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 OSS 120B High?

Key differences include context window (200K vs 131K), input pricing ($1.00 vs $0.10/M), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 4.5 and GPT OSS 120B High?

Claude Haiku 4.5 is developed by Anthropic and GPT OSS 120B High is developed by OpenAI.

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