Grok 4.3 vs GPT-5.2-Codex
Detailed technical comparison between Grok 4.3 (xAI) and GPT-5.2-Codex (OpenAI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
Grok 4.3
1,000,000 tokensTie
Equal CapabilityTie
Equal SpeedGrok 4.3
$1.25 / MTokGrok 4.3
Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...
GPT-5.2-Codex
GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Technical Specifications
🏆 = Superior Spec| Specification | Grok 4.3 | GPT-5.2-Codex |
|---|---|---|
| Provider | xAI | OpenAI |
| Context Window | 1,000,000 tokens🏆 | 400,000 tokens |
| Agent Suitability | 87/100 | N/A |
| Time to First Token (TTFT) | 400 ms | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2026-04-30 | 2026-01-14 |
API Pricing Comparison
Input Price per Million Tokens
Grok 4.3
$1.25
GPT-5.2-Codex
$1.75
Output Price per Million Tokens
Grok 4.3
$2.50
GPT-5.2-Codex
$14.00
💡 Cost Ratio: Grok 4.3 is 1.4x cheaper per input token than GPT-5.2-Codex.
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Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Standardized Scores (0–100%)Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.
Grok 4.3 Quirks & Gotchas
- ▸Strong coding performance — competitive with Claude Sonnet at similar price point
- ▸Upgrade to Grok 4.20 for improved reasoning and tool calling
GPT-5.2-Codex Quirks & Gotchas
No developer gotchas reported.
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