GPT-OSS 20B vs Grok 4
Compare pricing, context windows, and strengths for GPT-OSS 20B by OpenAI and Grok 4 by xAI - and see how to put either to work in Appaca.
GPT-OSS 20B
A 21-billion-parameter open-weight model from OpenAI, designed for efficient reasoning and long-context usage (≈ 128K tokens).
View GPT-OSS 20BGrok 4
A flagship multimodal model excelling in natural language, math, and deep reasoning with unmatched all-around performance.
View Grok 4GPT-OSS 20B vs Grok 4 at a glance
Specs and pricing side by side, from the Appaca AI models directory.
| Spec | GPT-OSS 20B | Grok 4 |
|---|---|---|
| Provider | OpenAI | xAI |
| Model type | Text | Text |
| Context window | 128K tokens | 256K tokens |
| Input price | Free (open weight) | $3 / 1M tokens |
| Output price | Free (open weight) | $15 / 1M tokens |
| Status | Current | Current |
How GPT-OSS 20B and Grok 4 differ
What the numbers mean in practice when choosing between GPT-OSS 20B and Grok 4.
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GPT-OSS 20B is an open-weight model with no per-token licensing fees, while Grok 4 charges $3 per million input tokens.
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Grok 4's 256K tokens context window is roughly 2x larger than GPT-OSS 20B's 128K tokens, so it can work across bigger codebases, contracts, or archives in one pass.
Strengths side by side
Where each model shines, according to benchmarks and provider positioning.
GPT-OSS 20B
- Open-weight / Apache 2.0 licensed: you can use, modify, and deploy freely (commercially & academically) under permissive terms.
- Large model size (≈ 21B parameters) with Mixture-of-Experts (MoE) architecture: only ~3.6B parameters active per token, yielding efficient inference.
- Very long context window support: up to ~128 K tokens (or ~131 K tokens per some sources) enabling in-depth reasoning, long documents, or multi-turn context.
- Adjustable reasoning effort: you can trade latency vs quality by tuning “reasoning effort” levels.
- Efficient hardware requirements (for its class): designed to run on a single 16 GB-class GPU or optimized local deployments for lower latency applications.
- Strong for tasks such as reasoning, tool-use, structured output, chain-of-thought debugging: because the model is open and you can inspect its chain of thought.
- Flexibility: since weights are available, you can self-host, fine-tune, or deploy offline, giving more control than closed API models.
Grok 4
1. Flagship-level reasoning and math performance
- Designed for world-class reasoning depth, precision, and multi-step logical chains.
- Excels at STEM, mathematics, symbolic operations, proofs, and analytical workloads.
2. Powerful multimodal understanding
- Supports text, images, and other modalities.
- Handles cross-modal reasoning tasks requiring context synthesis.
3. Extreme capability across diverse tasks
- Positioned as a top-tier 'jack of all trades' model.
- Strong in natural language, coding, knowledge retrieval, and structured generation.
4. Large 256K context window
- Enables analysis of long documents, entire codebases, multi-document packs, and extensive agent sessions.
- Supports workloads that require persistent reasoning across large inputs.
5. Advanced developer tooling support
- Function calling for tool-augmented workflows.
- Structured outputs for predictable, schema-controlled generation.
- Integrates smoothly with agents and complex automation pipelines.
6. Efficient caching for cost reduction
- Cached input tokens discounted to $0.75 / 1M tokens.
- Encourages RAG, retrieval pipelines, and multi-step conversational workflows.
7. Production-ready performance
- Stable rate limits: 480 requests per minute.
- High token throughput: 2,000,000 tokens per minute.
- Available across multiple xAI regional clusters.
8. Optional Live Search augmentation
- Add-on: $25 per 1K sources.
- Enhances factual accuracy and real-time information retrieval.
Use GPT-OSS 20B or Grok 4 - or both
Appaca is the AI workspace for operators. Build internal tools and AI co-workers powered by GPT-OSS 20B or Grok 4 - connected to your real data and ready for your whole team. No code, no deployment.
Describe it, and it's built
Tell the Appaca agent the internal tool you need and it builds a working app powered by GPT-OSS 20B or Grok 4. No code, no API keys, no deployment.
Switch models without rebuilding
Start on GPT-OSS 20B, test the same tool on Grok 4, and keep whichever performs better - the rest of your app stays exactly as it is.
Automated for the whole team
Schedule tools to run on autopilot - daily digests, weekly reports, real-time triggers - and share them with your whole team from one workspace.
Describe it, and it's built
Tell the Appaca agent what your team needs and it builds a working app powered by GPT-OSS 20B or Grok 4 - connected to the tools you already use.
Related comparisons
See how GPT-OSS 20B and Grok 4 stack up against other models in the directory.
FAQs
GPT-OSS 20B is open weight and free of per-token licensing fees, while Grok 4 costs $3 per million input tokens and $15 per million output tokens.
Grok 4 has the larger context window at 256K tokens, compared to 128K tokens for GPT-OSS 20B. A larger window means the model can consider more text at once - useful for long contracts, codebases, or months of records.
It depends on the job. Compare the pricing, context window, and strengths above against your workload - and remember the choice isn't permanent. In Appaca you can build a tool on GPT-OSS 20B, test the same tool on Grok 4, and switch at any time without rebuilding anything.
Yes. Appaca is a no-code AI workspace: describe the internal tool your team needs and the Appaca agent builds it as a working app powered by GPT-OSS 20B, Grok 4, or any other model in the directory - with a built-in database, team access, and integrations. No API keys to wire up and nothing to deploy.
Build AI tools with GPT-OSS 20B or Grok 4
Describe the tool your team needs and get a working app powered by the model you choose - with a built-in database, team access, and integrations. No code, no deployment.