Model Comparison

Claude 3.5 Sonnet vs GPT OSS 20B

Claude 3.5 Sonnet shows notably better performance in the majority of benchmarks. GPT OSS 20B is 68.6x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Claude 3.5 Sonnet outperforms in 2 benchmarks (MMLU, TAU-bench Retail), while GPT OSS 20B is better at 1 benchmark (GPQA).

Claude 3.5 Sonnet shows notably better performance in the majority of benchmarks.

Mon May 25 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 3.5 Sonnet ($3.00/1M tokens) is 60.0x more expensive than GPT OSS 20B ($0.05/1M tokens).

For output processing, Claude 3.5 Sonnet ($15.00/1M tokens) is 75.0x more expensive than GPT OSS 20B ($0.20/1M tokens).

In conclusion, Claude 3.5 Sonnet is more expensive than GPT OSS 20B.*

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

Lowest available price from all providers

Mon May 25 2026 • llm-stats.com

Claude 3.5 Sonnet

Input tokens$3.00

Output tokens$15.00

Best providerAnthropic

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 3.5 Sonnet accepts 200,000 input tokens compared to GPT OSS 20B's 131,072 tokens. Claude 3.5 Sonnet can generate longer responses up to 200,000 tokens, while GPT OSS 20B is limited to 32,768 tokens.

Claude 3.5 Sonnet

Input200,000 tokens

Output200,000 tokens

GPT OSS 20B

Input131,072 tokens

Output32,768 tokens

Mon May 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude 3.5 Sonnet supports multimodal inputs, whereas GPT OSS 20B does not.

Claude 3.5 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude 3.5 Sonnet

Text

Images

Audio

Video

GPT OSS 20B

Text

Images

Audio

Video

License

Usage and distribution terms

Claude 3.5 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 3.5 Sonnet

Proprietary

Closed source

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude 3.5 Sonnet was released on 2024-10-22, while GPT OSS 20B was released on 2025-08-05.

GPT OSS 20B is 10 months newer than Claude 3.5 Sonnet.

Claude 3.5 Sonnet

Oct 22, 2024

1.6 years ago

GPT OSS 20B

Aug 5, 2025

9 months ago

9mo 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 3.5 Sonnet is available from Anthropic, Bedrock, Google. GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI.

Claude 3.5 Sonnet

Anthropic

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

AWS Bedrock

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Google

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

GPT OSS 20B

Novita

Input Price:Input: $0.05/1MOutput Price:Output: $0.20/1M

Fireworks

Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

Groq

Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

OpenAI

Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Claude 3.5 Sonnet

View details

Anthropic

Larger context window (200,000 tokens)

Supports multimodal inputs

Higher MMLU score (90.4% vs 85.3%)

Higher TAU-bench Retail score (69.2% vs 54.8%)

GPT OSS 20B

View details

OpenAI

Less expensive input tokens

Less expensive output tokens

Has open weights

Higher GPQA score (71.5% vs 67.2%)

Detailed Comparison

AI Model Comparison Table
Feature	Claude 3.5 Sonnet	GPT OSS 20B

FAQ

Common questions about Claude 3.5 Sonnet vs GPT OSS 20B.

Which is better, Claude 3.5 Sonnet or GPT OSS 20B?

Claude 3.5 Sonnet shows notably better performance in the majority of benchmarks. Claude 3.5 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 3.5 Sonnet compare to GPT OSS 20B in benchmarks?

Claude 3.5 Sonnet scores GSM8k: 96.4%, DocVQA: 95.2%, AI2D: 94.7%, HumanEval: 93.7%, BIG-Bench Hard: 93.1%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

Is Claude 3.5 Sonnet cheaper than GPT OSS 20B?

GPT OSS 20B is 60.0x cheaper for input tokens. Claude 3.5 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 3.5 Sonnet and GPT OSS 20B?

Claude 3.5 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 3.5 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 3.5 Sonnet and GPT OSS 20B?

Claude 3.5 Sonnet is developed by Anthropic and GPT OSS 20B is developed by OpenAI.