Mercury 2 vs GPT-5.2-Codex
Detailed technical comparison between Mercury 2 (Inception AI) 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
GPT-5.2-Codex
400,000 tokensTie
Equal CapabilityTie
Equal SpeedMercury 2
$0.25 / MTokMercury 2
Mercury 2 is an extremely fast reasoning LLM, and the first reasoning diffusion LLM (dLLM). Instead of generating tokens sequentially, Mercury 2 produces and refines multiple tokens in parallel, achieving...
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 | Mercury 2 | GPT-5.2-Codex |
|---|---|---|
| Provider | Inception AI | OpenAI |
| Context Window | 128,000 tokens | 400,000 tokens🏆 |
| Agent Suitability | Not yet benchmarked | Not yet benchmarked |
| Time to First Token (TTFT) | No public TTFT data | No public TTFT data |
| Deployment Model | managed api | managed api |
| Production Stability | Stable GA (est.) | Stable GA (est.) |
| API Available | Yes | Yes |
| Released Date | 2026-03-04 | 2026-01-14 |
API Pricing Comparison
Input Price per Million Tokens
Mercury 2
$0.25
GPT-5.2-Codex
$1.75
Output Price per Million Tokens
Mercury 2
$0.75
GPT-5.2-Codex
$14.00
💡 Cost Ratio: Mercury 2 is 7.0x cheaper per input token than GPT-5.2-Codex.
Want to test both models live?
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.
Mercury 2 Quirks & Gotchas
No developer gotchas reported.
GPT-5.2-Codex Quirks & Gotchas
No developer gotchas reported.
Explore Other Popular Comparisons
Mercury 2 vs GLM 4.7 Flash
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWMercury 2 vs DeepSeek V3.1
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWMercury 2 vs Mistral Medium 3.1
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWMercury 2 vs Kimi K3
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWMercury 2 vs Qwen3 VL 8B Instruct
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWMercury 2 vs MiniMax M1
Compare context windows, live API token prices, and benchmark scores.