Model Comparison

Claude Sonnet 4 vs GPT OSS 120B

Both models are evenly matched across the benchmarks. GPT OSS 120B is 33.3x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Claude Sonnet 4 outperforms in 1 benchmarks (TAU-bench Retail), while GPT OSS 120B is better at 1 benchmark (GPQA).

Both models are evenly matched across the benchmarks.

Fri May 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 120B costs less

For input processing, Claude Sonnet 4 ($3.00/1M tokens) is 33.3x more expensive than GPT OSS 120B ($0.09/1M tokens).

For output processing, Claude Sonnet 4 ($15.00/1M tokens) is 33.3x more expensive than GPT OSS 120B ($0.45/1M tokens).

In conclusion, Claude Sonnet 4 is more expensive than GPT OSS 120B.*

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

Lowest available price from all providers
Fri May 15 2026 • llm-stats.com
Anthropic
Claude Sonnet 4
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
GPT OSS 120B
Input tokens$0.09
Output tokens$0.45
Best providerDeepinfra
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Context Window

Maximum input and output token capacity

Claude Sonnet 4 accepts 200,000 input tokens compared to GPT OSS 120B's 131,072 tokens. GPT OSS 120B can generate longer responses up to 131,072 tokens, while Claude Sonnet 4 is limited to 64,000 tokens.

Anthropic
Claude Sonnet 4
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
Fri May 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Sonnet 4 supports multimodal inputs, whereas GPT OSS 120B does not.

Claude Sonnet 4 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Sonnet 4

Text
Images
Audio
Video

GPT OSS 120B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Sonnet 4 is licensed under a proprietary license, while GPT OSS 120B uses Apache 2.0.

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

Claude Sonnet 4

Proprietary

Closed source

GPT OSS 120B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Sonnet 4 was released on 2025-05-22, while GPT OSS 120B was released on 2025-08-05.

GPT OSS 120B is 3 months newer than Claude Sonnet 4.

Claude Sonnet 4

May 22, 2025

11 months ago

GPT OSS 120B

Aug 5, 2025

9 months ago

2mo newer

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 Sonnet 4 is available from Anthropic, Bedrock, Google. GPT OSS 120B is available from DeepInfra, Novita, OpenAI, Fireworks, Groq.

Claude Sonnet 4

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
bedrock logo
AWS Bedrock
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
google logo
Google
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

GPT OSS 120B

deepinfra logo
Deepinfra
Input Price:Input: $0.09/1MOutput Price:Output: $0.45/1M
novita logo
Novita
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
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
groq logo
Groq
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher TAU-bench Retail score (80.5% vs 67.8%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher GPQA score (80.1% vs 75.4%)
AnthropicClaude Sonnet 4
OpenAIGPT OSS 120B
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4
OpenAI
GPT OSS 120B

FAQ

Common questions about Claude Sonnet 4 vs GPT OSS 120B.

Which is better, Claude Sonnet 4 or GPT OSS 120B?

Both models are evenly matched across the benchmarks. Claude Sonnet 4 is made by Anthropic and GPT OSS 120B is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Sonnet 4 compare to GPT OSS 120B in benchmarks?

Claude Sonnet 4 scores MMMLU: 86.5%, TAU-bench Retail: 80.5%, GPQA: 75.4%, MMMU: 74.4%, SWE-Bench Verified: 72.7%. GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%.

Is Claude Sonnet 4 cheaper than GPT OSS 120B?

GPT OSS 120B is 33.3x cheaper for input tokens. Claude Sonnet 4 costs $3.00/M input and $15.00/M output via anthropic. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra.

What are the context window sizes for Claude Sonnet 4 and GPT OSS 120B?

Claude Sonnet 4 supports 200K tokens and GPT OSS 120B 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 Sonnet 4 and GPT OSS 120B?

Key differences include context window (200K vs 131K), input pricing ($3.00 vs $0.09/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 Sonnet 4 and GPT OSS 120B?

Claude Sonnet 4 is developed by Anthropic and GPT OSS 120B is developed by OpenAI.