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GPT OSS 20B vs Grok 4.6

Comparing GPT OSS 20B and Grok 4.6 across benchmarks, pricing, and capabilities.

OpenAI · xAI · Updated for 2026

Which is better?

GPT OSS 20B and Grok 4.6 trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, GPT OSS 20B is roughly 34.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok 4.6 also accepts a larger context window (500,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current benchmark, pricing, and model metadata for 2026.

Choose GPT OSS 20B

  • cost matters — it's about 34.3x cheaper per token
  • you need open weights you can self-host or fine-tune

Choose Grok 4.6

  • you process long inputs — it offers a 500,000 token context window
  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

GPT OSS 20B
OpenAI
Grok 4.6
xAI
Benchmark wins
—
—
Input price
$0.05 / M
$2.00 / M
Output price
$0.20 / M
$6.00 / M
Context window
131,072
500,000
Released
Aug 2025
Aug 2026
License
Apache 2.0
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GPT OSS 20B and Grok 4.6don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Playground indexes and blind preference scores

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B costs less

For input processing, GPT OSS 20B ($0.05/1M tokens) is 40.0x cheaper than Grok 4.6 ($2.00/1M tokens).

For output processing, GPT OSS 20B ($0.20/1M tokens) is 30.0x cheaper than Grok 4.6 ($6.00/1M tokens).

In conclusion, Grok 4.6 is more expensive than GPT OSS 20B.*

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

Lowest available price from all providers
Tue Aug 25 2026 • llm-stats.com
OpenAI
GPT OSS 20B
Input tokens$0.05
Output tokens$0.20
Best providerNovita
xAI
Grok 4.6
Input tokens$2.00
Output tokens$6.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok 4.6 accepts 500,000 input tokens compared to GPT OSS 20B's 131,072 tokens. Only GPT OSS 20B specifies output context (32,768 tokens).

OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
xAI
Grok 4.6
Input500,000 tokens
Output- tokens
Tue Aug 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok 4.6 supports multimodal inputs, whereas GPT OSS 20B does not.

Grok 4.6 can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT OSS 20B

Text
Images
Audio
Video

Grok 4.6

Text
Images
Audio
Video

License

Usage and distribution terms

GPT OSS 20B is licensed under Apache 2.0, while Grok 4.6 uses a proprietary license.

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

GPT OSS 20B

Apache 2.0

Open weights

Grok 4.6

Proprietary

Closed source

Release Timeline

When each model was launched

GPT OSS 20B was released on 2025-08-05, while Grok 4.6 was released on 2026-08-12.

Grok 4.6 is 12 months newer than GPT OSS 20B.

GPT OSS 20B

Aug 5, 2025

1.1 years ago

Grok 4.6

Aug 12, 2026

1 weeks ago

1.0yr newer

Knowledge Cutoff

When training data ends

Grok 4.6 has a documented knowledge cutoff of 2026-02-01, while GPT OSS 20B's cutoff date is not specified.

We can confirm Grok 4.6's training data extends to 2026-02-01, but cannot make a direct comparison without GPT OSS 20B's cutoff date.

GPT OSS 20B

—

Grok 4.6

Feb 2026

Provider Availability

GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI. Grok 4.6 is available from xAI.

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

Grok 4.6

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $6.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT OSS 20B and Grok 4.6 side-by-side, then vote on the output you prefer.

GPT OSS 20B
✓ Preferred
Grok 4.6
Open in Playground

FAQ

Common questions about GPT OSS 20B vs Grok 4.6.

Which is better, GPT OSS 20B or Grok 4.6?

GPT OSS 20B (OpenAI) and Grok 4.6 (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does GPT OSS 20B compare to Grok 4.6 in benchmarks?

GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%. Grok 4.6 scores CursorBench v3.2: 69.9%, DeepSWE 1.1: 65.9%, FrontierCode: 61.3%, AA-Index: 61.0%, GDPval-AA: 58.4%.

Is GPT OSS 20B cheaper than Grok 4.6?

GPT OSS 20B is 40.0x cheaper for input tokens. GPT OSS 20B costs $0.05/M input and $0.20/M output via novita. Grok 4.6 costs $2.00/M input and $6.00/M output via xai.

What are the context window sizes for GPT OSS 20B and Grok 4.6?

GPT OSS 20B supports 131K tokens and Grok 4.6 supports 500K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT OSS 20B and Grok 4.6?

Key differences include context window (131K vs 500K), input pricing ($0.05 vs $2.00/M), multimodal support (no vs yes), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 20B and Grok 4.6?

GPT OSS 20B is developed by OpenAI and Grok 4.6 is developed by xAI.

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