Model Comparison

Claude Opus 5 vs GPT OSS 120B HighWhich is better in 2026?

Comparing Claude Opus 5 and GPT OSS 120B High across benchmarks, pricing, and capabilities.

Verdict: Claude Opus 5 vs GPT OSS 120B High — which is better?

Claude Opus 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.

On price, GPT OSS 120B High is roughly 50.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 5 if…

  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Jul 2026

Choose GPT OSS 120B High if…

  • cost matters — it's about 50.0x cheaper per token
  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Opus 5 and GPT OSS 120B Highdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 120B High costs less

For input processing, Claude Opus 5 ($5.00/1M tokens) is 50.0x more expensive than GPT OSS 120B High ($0.10/1M tokens).

For output processing, Claude Opus 5 ($25.00/1M tokens) is 50.0x more expensive than GPT OSS 120B High ($0.50/1M tokens).

In conclusion, Claude Opus 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 27 2026 • llm-stats.com
Anthropic
Claude Opus 5
Input tokens$5.00
Output tokens$25.00
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 Opus 5 accepts 1,000,000 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 Opus 5 is limited to 128,000 tokens.

Anthropic
Claude Opus 5
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT OSS 120B High
Input131,072 tokens
Output131,072 tokens
Mon Jul 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Opus 5 supports multimodal inputs, whereas GPT OSS 120B High does not.

Claude Opus 5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 5

Text
Images
Audio
Video

GPT OSS 120B High

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Opus 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 Opus 5

Proprietary

Closed source

GPT OSS 120B High

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Opus 5 was released on 2026-07-24, while GPT OSS 120B High was released on 2025-08-05.

Claude Opus 5 is 12 months newer than GPT OSS 120B High.

Claude Opus 5

Jul 24, 2026

3 days ago

11mo newer
GPT OSS 120B High

Aug 5, 2025

11 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Opus 5 is available from Anthropic. GPT OSS 120B High is available from OpenAI, Fireworks.

Claude Opus 5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

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 (1,000,000 tokens)
Supports multimodal inputs
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Opus 5 and GPT OSS 120B High side-by-side, then vote on the output you prefer.

Claude Opus 5
✓ Preferred
GPT OSS 120B High
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Opus 5
OpenAI
GPT OSS 120B High

FAQ

Common questions about Claude Opus 5 vs GPT OSS 120B High.

Which is better, Claude Opus 5 or GPT OSS 120B High?

Claude Opus 5 (Anthropic) and GPT OSS 120B High (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Claude Opus 5 compare to GPT OSS 120B High in benchmarks?

Claude Opus 5 scores BrowseComp: 90.8%, BioMysteryBench: 90.1%, OSWorld 2.0: 70.6%, DeepSWE 1.1: 68.8%, Humanity's Last Exam: 64.7%. 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 Opus 5 cheaper than GPT OSS 120B High?

GPT OSS 120B High is 50.0x cheaper for input tokens. Claude Opus 5 costs $5.00/M input and $25.00/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 Opus 5 and GPT OSS 120B High?

Claude Opus 5 supports 1.0M 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 Opus 5 and GPT OSS 120B High?

Key differences include context window (1.0M vs 131K), input pricing ($5.00 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 Opus 5 and GPT OSS 120B High?

Claude Opus 5 is developed by Anthropic and GPT OSS 120B High is developed by OpenAI.

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