Comprehensive side-by-side LLM comparison
GPT OSS 120B leads with 9.6% higher average benchmark score. GPT OSS 120B offers 245.8K more tokens in context window than DeepSeek-V2.5. Both models have similar pricing. GPT OSS 120B is available on 5 providers. Overall, GPT OSS 120B is the stronger choice for coding tasks.
DeepSeek
DeepSeek-V2.5 was developed as an enhanced iteration of the DeepSeek-V2 architecture, designed to incorporate improvements in model quality and efficiency. Built to advance the DeepSeek foundation model series, it provides refined capabilities for general-purpose language understanding and generation tasks.
OpenAI
GPT-OSS 120B was developed as an open-source model release from OpenAI, designed to provide the research and developer community with access to a capable language model. Built with 120 billion parameters, it enables experimentation, fine-tuning, and deployment in contexts where open-source licensing and transparency are valued.
1 year newer

DeepSeek-V2.5
DeepSeek
2024-05-08

GPT OSS 120B
OpenAI
2025-08-05
Cost per million tokens (USD)

DeepSeek-V2.5

GPT OSS 120B
Context window and performance specifications
Average performance across 1 common benchmarks

DeepSeek-V2.5

GPT OSS 120B
Available providers and their performance metrics

DeepSeek-V2.5
DeepInfra
DeepSeek
Hyperbolic

DeepSeek-V2.5

GPT OSS 120B

DeepSeek-V2.5

GPT OSS 120B

GPT OSS 120B
DeepInfra
Groq
Novita
OpenAI
ZeroEval