DeepSeek V3.2 vs GPT-5.2 Codex: Benchmarks, Pricing & Capabilities Compared
TL;DR — DeepSeek V3.2 wins for cost + long-context · GPT-5.2 Codex wins for general use.
DeepSeek V3.2 DeepSeek
- Released
- 2026-02-12
- Context window
- 1M tokens
- Input price
- $0.27 / Mtok
- Output price
- $1.10 / Mtok
Key features
- 1M+ token context window (10x expansion)
- Improved reasoning capabilities
- Open source release
GPT-5.2 Codex OpenAI
- Released
- 2025-12-18
- Context window
- 256K tokens
- Input price
- $1.50 / Mtok
- Output price
- $12.00 / Mtok
Key features
- Specialized for software engineering
- Enhanced agentic coding
- Multi-file refactoring
Benchmark comparison
| Benchmark | DeepSeek V3.2 | GPT-5.2 Codex |
|---|---|---|
| HumanEval | 92.5% | 95.1% ✓ |
| LiveCodeBench | 72.1% | 80.4% ✓ |
Pricing comparison
| Metric | DeepSeek V3.2 | GPT-5.2 Codex |
|---|---|---|
| Input ($/Mtok) | $0.27 | $1.50 |
| Output ($/Mtok) | $1.10 | $12.00 |
| Cached input ($/Mtok) | $0.07 | — |
| Cost per 1M-token roundtrip (1M in + 1M out) | $1.37 | $13.50 |
Context window & modalities
| Attribute | DeepSeek V3.2 | GPT-5.2 Codex |
|---|---|---|
| Context window | 1M tokens | 256K tokens |
| Input modalities | text | text, image |
| Output modalities | text | text |
| Knowledge cutoff | 2025-09 | 2025-08 |
Verdict by use case
Coding
→ GPT-5.2 Codex
Basis: LiveCodeBench
DeepSeek V3.2 72.1% vs GPT-5.2 Codex 80.4% on LiveCodeBench.
Reasoning
Insufficient data
Basis: GPQA / MMLU
No shared reasoning benchmark.
Math
Insufficient data
Basis: MATH / AIME
No shared math benchmark.
Long context
→ DeepSeek V3.2
Basis: Context window
DeepSeek V3.2 1M tokens vs GPT-5.2 Codex 256K tokens.
Cost
→ DeepSeek V3.2
Basis: Input $/Mtok
DeepSeek V3.2 $0.27/Mtok vs GPT-5.2 Codex $1.5/Mtok input.
Changelog & releases
DeepSeek V3.2
Released 2026-02-12
Predecessor: deepseek-deepseek-v3
- 10x context window expansion (128K → 1M+ tokens)
- Sliding-window attention for long-context throughput
- Improved chain-of-thought reasoning
- Native FP8 inference support