GPT-5.2 Codex vs Grok 3
Compare pricing, context windows, and strengths for GPT-5.2 Codex by OpenAI and Grok 3 by xAI - and see how to put either to work in Appaca.
GPT-5.2 Codex
Highly capable coding model optimized for long-horizon, agentic coding tasks with configurable reasoning and strong codebase awareness.
View GPT-5.2 CodexGrok 3
A high-performance enterprise model for coding, extraction, reasoning, and domain-expert tasks across finance, healthcare, law, and science.
View Grok 3GPT-5.2 Codex vs Grok 3 at a glance
Specs and pricing side by side, from the Appaca AI models directory.
| Spec | GPT-5.2 Codex | Grok 3 |
|---|---|---|
| Provider | OpenAI | xAI |
| Model type | Text | Text |
| Context window | 400K tokens | 131.1K tokens |
| Input price | $1.75 / 1M tokens | $3 / 1M tokens |
| Output price | $14 / 1M tokens | $15 / 1M tokens |
| Status | Superseded by GPT-5.3 Codex | Current |
How GPT-5.2 Codex and Grok 3 differ
What the numbers mean in practice when choosing between GPT-5.2 Codex and Grok 3.
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GPT-5.2 Codex is 42% cheaper on input tokens ($1.75 vs $3 per million), which adds up quickly in document-heavy workloads.
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GPT-5.2 Codex is 7% cheaper on output tokens ($14 vs $15 per million) - the bigger factor for tools that generate long documents.
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GPT-5.2 Codex's 400K tokens context window is roughly 3.1x larger than Grok 3's 131.1K tokens, so it can work across bigger codebases, contracts, or archives in one pass.
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GPT-5.2 Codex has been superseded by GPT-5.3 Codex - for new builds, consider the newer model first.
Strengths side by side
Where each model shines, according to benchmarks and provider positioning.
GPT-5.2 Codex
1. Optimized for Long-Horizon Coding Tasks
- OpenAI describes GPT-5.2 Codex as a highly intelligent coding model built for long-horizon, agentic coding work.
- Well suited to planning, refactoring, debugging, and multi-step implementation flows inside real codebases.
2. Adjustable Reasoning for Coding Work
- Supports configurable reasoning effort from low to xhigh depending on speed and quality needs.
- Accepts both text and image inputs while producing text output.
3. Large Context + Long Output
- 400 k token context window supports broad repository understanding and larger working sets.
- Allows up to 128 k output tokens for longer patches, code generation, and technical explanations.
4. Up-to-Date Model Snapshot
- Knowledge cut-off of Aug 31 2025 keeps it current with newer tools and frameworks.
- Supports streaming, function calling, and structured outputs for tool-driven coding workflows.
Grok 3
1. Strong enterprise-grade reasoning
- Built for deep logical reasoning, structured decision-making, and multi-step analysis.
- Performs exceptionally in domains requiring precision: law, finance, healthcare, and STEM.
2. Excellent at data extraction and summarization
- Optimized for structured extraction from documents, PDFs, tables, and complex text.
- Ideal for enterprise workflows like reporting, compliance automation, or knowledge mining.
3. High-performance coding capabilities
- Excels at code generation, debugging, refactoring, and explaining code.
- Competitive with top-tier coding models for multi-file, long-context code reasoning.
4. Supports function calling and structured outputs
- Integrates cleanly with agent frameworks and external tools.
- Predictable, schema-aligned responses suitable for production systems.
5. Large 131K context window
- Handles long documents, transcripts, contracts, codebases, or multi-document tasks.
- Useful for ingesting highly technical materials in one pass.
6. Efficient cost structure with cached token pricing
- Cached inputs: only $0.75 / 1M tokens, enabling large-scale systems.
- Encourages reuse for powerful retrieval-augmented workflows.
7. Enterprise reliability and availability
- Supported across multiple regions (us-east-1, eu-west-1).
- Consistent rate limits: 600 requests/min.
- Suitable for production-grade apps with stability requirements.
8. Supports advanced search capabilities
- Optional Live Search add-on for real-time knowledge retrieval.
- Pricing: $25 per 1K sources.
Use GPT-5.2 Codex or Grok 3 - or both
Appaca is the AI workspace for operators. Build internal tools and AI co-workers powered by GPT-5.2 Codex or Grok 3 - 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-5.2 Codex or Grok 3. No code, no API keys, no deployment.
Switch models without rebuilding
Start on GPT-5.2 Codex, test the same tool on Grok 3, 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-5.2 Codex or Grok 3 - connected to the tools you already use.
Related comparisons
See how GPT-5.2 Codex and Grok 3 stack up against other models in the directory.
FAQs
GPT-5.2 Codex is generally cheaper: $1.75 input / $14 output per million tokens, versus $3 / $15 for Grok 3. Actual cost depends on how many tokens your workload reads and writes.
GPT-5.2 Codex has the larger context window at 400K tokens, compared to 131.1K tokens for Grok 3. 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-5.2 Codex, test the same tool on Grok 3, 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-5.2 Codex, Grok 3, 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-5.2 Codex or Grok 3
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.