Model Comparison

Claude 3 Sonnet vs GPT OSS 20B

GPT OSS 20B significantly outperforms across most benchmarks. GPT OSS 20B is 68.6x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Claude 3 Sonnet outperforms in 0 benchmarks, while GPT OSS 20B is better at 2 benchmarks (GPQA, MMLU).

GPT OSS 20B significantly outperforms across most benchmarks.

Tue May 12 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B costs less

For input processing, Claude 3 Sonnet ($3.00/1M tokens) is 60.0x more expensive than GPT OSS 20B ($0.05/1M tokens).

For output processing, Claude 3 Sonnet ($15.00/1M tokens) is 75.0x more expensive than GPT OSS 20B ($0.20/1M tokens).

In conclusion, Claude 3 Sonnet is more expensive than GPT OSS 20B.*

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

Lowest available price from all providers
Tue May 12 2026 • llm-stats.com
Anthropic
Claude 3 Sonnet
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
GPT OSS 20B
Input tokens$0.05
Output tokens$0.20
Best providerNovita
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude 3 Sonnet accepts 200,000 input tokens compared to GPT OSS 20B's 131,072 tokens. Claude 3 Sonnet can generate longer responses up to 200,000 tokens, while GPT OSS 20B is limited to 32,768 tokens.

Anthropic
Claude 3 Sonnet
Input200,000 tokens
Output200,000 tokens
OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
Tue May 12 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude 3 Sonnet supports multimodal inputs, whereas GPT OSS 20B does not.

Claude 3 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude 3 Sonnet

Text
Images
Audio
Video

GPT OSS 20B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude 3 Sonnet is licensed under a proprietary license, while GPT OSS 20B uses Apache 2.0.

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

Claude 3 Sonnet

Proprietary

Closed source

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude 3 Sonnet was released on 2024-02-29, while GPT OSS 20B was released on 2025-08-05.

GPT OSS 20B is 17 months newer than Claude 3 Sonnet.

Claude 3 Sonnet

Feb 29, 2024

2.2 years ago

GPT OSS 20B

Aug 5, 2025

9 months ago

1.4yr 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 3 Sonnet is available from Anthropic, Bedrock, Google. GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI.

Claude 3 Sonnet

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 20B

novita logo
Novita
Input Price:Input: $0.05/1MOutput Price:Output: $0.20/1M
fireworks logo
Fireworks
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
groq logo
Groq
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
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher GPQA score (71.5% vs 40.4%)
Higher MMLU score (85.3% vs 79.0%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude 3 Sonnet
OpenAI
GPT OSS 20B

FAQ

Common questions about Claude 3 Sonnet vs GPT OSS 20B.

Which is better, Claude 3 Sonnet or GPT OSS 20B?

GPT OSS 20B significantly outperforms across most benchmarks. Claude 3 Sonnet is made by Anthropic and GPT OSS 20B is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude 3 Sonnet compare to GPT OSS 20B in benchmarks?

Claude 3 Sonnet scores ARC-C: 93.2%, GSM8k: 92.3%, HellaSwag: 89.0%, MGSM: 83.5%, BIG-Bench Hard: 82.9%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

Is Claude 3 Sonnet cheaper than GPT OSS 20B?

GPT OSS 20B is 60.0x cheaper for input tokens. Claude 3 Sonnet costs $3.00/M input and $15.00/M output via anthropic. GPT OSS 20B costs $0.05/M input and $0.20/M output via novita.

What are the context window sizes for Claude 3 Sonnet and GPT OSS 20B?

Claude 3 Sonnet supports 200K tokens and GPT OSS 20B 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 3 Sonnet and GPT OSS 20B?

Key differences include context window (200K vs 131K), input pricing ($3.00 vs $0.05/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 3 Sonnet and GPT OSS 20B?

Claude 3 Sonnet is developed by Anthropic and GPT OSS 20B is developed by OpenAI.