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Claude Opus 4.6 vs GPT-OSS-120B
Comprehensive side-by-side LLM comparison
Claude Opus 4.6 leads with 47.7% higher average benchmark score. Claude Opus 4.6 offers 195.9K more tokens in context window than GPT-OSS-120B. Claude Opus 4.6 is $Infinity cheaper per million tokens. Claude Opus 4.6 supports multimodal inputs. Claude Opus 4.6 is available on 3 providers. Overall, Claude Opus 4.6 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.6, released by Anthropic in February 2026, is a large language model from the Claude 4 family designed for complex agent orchestration, extended reasoning, and long-form code generation. It features a 200K token context window (extendable to 1M tokens in beta), 128K maximum output tokens, native image understanding, and extended thinking with both standard and adaptive effort modes. Opus 4.6 targets multi-step agentic workflows, parallel tool use, and applications requiring sustained reasoning over large contexts.
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OpenAI
GPT-OSS-120B, released by OpenAI in August 2025, is an open-weight large language model with 120 billion parameters distributed under the Apache 2.0 license. It represents OpenAI's entry into the open-source model space, enabling developers to self-host and fine-tune a GPT-5-generation-class model. GPT-OSS-120B targets research applications, on-premises deployments, and custom fine-tuning workflows requiring a large open-weight base model.
6 months newer
GPT-OSS-120B
OpenAI
2025-08
Claude Opus 4.6
Anthropic
2026-02
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.6
Input:$5.00
Output:$25.00($Infinity cheaper)
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GPT-OSS-120B
Input:$Infinity
Output:$Infinity
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Opus 4.6
Average Score:87.6%(+47.7%)
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GPT-OSS-120B
Average Score:39.9%
Performance comparison across key benchmark categories
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Claude Opus 4.6
Science91.3%(+13.0%)
Agents84.0%(+82.4%)
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GPT-OSS-120B
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.6
2025-05
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Opus 4.6
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-OSS-120B
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Claude Opus 4.6
Avg Score:87.6%(+47.7%)
Providers:3
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GPT-OSS-120B
Avg Score:39.9%
Providers:1