Claude Opus 4.5 vs GPT OSS 120B High
Claude Opus 4.5 leads the LLM Stats Score 38.3 to 25.5. GPT OSS 120B High is 50.0x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Opus 4.5 leads the overall LLM Stats Score 38.3 to 25.5, ranking #63 overall.
In the 2 individual benchmarks reported for both models, Claude Opus 4.5 wins 2; this is a narrower head-to-head signal than the composite indexes.
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 4.5 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Opus 4.5
- overall performance matters — it scores 38.3 and ranks #63 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you process long inputs — it offers a 200,000 token context window
- you want the most recent training data — it shipped Nov 2025
Choose GPT OSS 120B High
- cost matters — it's about 50.0x cheaper per token
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
11 reported for Claude Opus 4.5 · 7 for GPT OSS 120B High
Claude Opus 4.5 outperforms in 2 benchmarks (GPQA, MMMLU), while GPT OSS 120B High is better at 0 benchmarks.
Claude Opus 4.5 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 50.0x more expensive than GPT OSS 120B High ($0.10/1M tokens).
For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 50.0x more expensive than GPT OSS 120B High ($0.50/1M tokens).
In conclusion, Claude Opus 4.5 is more expensive than GPT OSS 120B High.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Opus 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 Opus 4.5 is limited to 64,000 tokens.
Input capabilities
Documented input modalities across available providers
Claude Opus 4.5 supports multimodal inputs, whereas GPT OSS 120B High does not.
Claude Opus 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Opus 4.5
GPT OSS 120B High
License
Usage and distribution terms
Claude Opus 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.
Proprietary
Closed source
Apache 2.0
Open weights
Release Timeline
When each model was launched
Claude Opus 4.5 was released on 2025-11-24, while GPT OSS 120B High was released on 2025-08-05.
Claude Opus 4.5 is 4 months newer than GPT OSS 120B High.
Nov 24, 2025
9 months ago
3mo newerAug 5, 2025
1.1 years ago
Knowledge Cutoff
When training data ends
Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while GPT OSS 120B High's cutoff date is not specified.
We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without GPT OSS 120B High's cutoff date.
Mar 2025
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Provider Availability
Claude Opus 4.5 is available from Anthropic. GPT OSS 120B High is available from OpenAI, Fireworks.
Claude Opus 4.5
GPT OSS 120B High
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 4.5 and GPT OSS 120B High side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 4.5 vs GPT OSS 120B High.