Compare · ModelsLive · 2 picked · head to head
DeepSeek V4 Flash vs GPT-5.1-Codex
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.1-Codex wins on 5/8 benchmarks
GPT-5.1-Codex wins 5 of 8 shared benchmarks. Leads in coding · language · knowledge.
Category leads
coding·GPT-5.1-Codexreasoning·DeepSeek V4 Flashlanguage·GPT-5.1-Codexmath·DeepSeek V4 Flashknowledge·GPT-5.1-Codex
Hype vs Reality
Attention vs performance
DeepSeek V4 Flash
#31 by perf·no signal
GPT-5.1-Codex
#27 by perf·no signal
Best value
DeepSeek V4 Flash
43.7x better value than GPT-5.1-Codex
DeepSeek V4 Flash
533.3 pts/$
$0.13/M
GPT-5.1-Codex
12.2 pts/$
$5.63/M
Vendor risk
Mixed exposure
One or more vendors flagged
DeepSeek
$3.4B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
8 benchmarks · 2 models
DeepSeek V4 FlashGPT-5.1-Codex
LiveBench · Agentic Coding
GPT-5.1-Codex leads by +3.3
DeepSeek V4 Flash
50.0
GPT-5.1-Codex
53.3
LiveBench · Coding
GPT-5.1-Codex leads by +2.6
DeepSeek V4 Flash
69.2
GPT-5.1-Codex
71.8
LiveBench · Data Analysis
DeepSeek V4 Flash leads by +7.3
DeepSeek V4 Flash
68.0
GPT-5.1-Codex
60.8
LiveBench · If
GPT-5.1-Codex leads by +0.3
DeepSeek V4 Flash
63.1
GPT-5.1-Codex
63.4
LiveBench · Language
DeepSeek V4 Flash leads by +0.6
DeepSeek V4 Flash
70.1
GPT-5.1-Codex
69.5
LiveBench · Mathematics
DeepSeek V4 Flash leads by +0.1
DeepSeek V4 Flash
79.7
GPT-5.1-Codex
79.6
LiveBench · Overall
GPT-5.1-Codex leads by +1.4
DeepSeek V4 Flash
67.3
GPT-5.1-Codex
68.6
LiveBench · Reasoning
GPT-5.1-Codex leads by +11.4
DeepSeek V4 Flash
70.6
GPT-5.1-Codex
82.0
Full benchmark table
| Benchmark | DeepSeek V4 Flash | GPT-5.1-Codex |
|---|---|---|
LiveBench · Agentic Coding | 50.0 | 53.3 |
LiveBench · Coding | 69.2 | 71.8 |
LiveBench · Data Analysis | 68.0 | 60.8 |
LiveBench · If | 63.1 | 63.4 |
LiveBench · Language | 70.1 | 69.5 |
LiveBench · Mathematics | 79.7 | 79.6 |
LiveBench · Overall | 67.3 | 68.6 |
LiveBench · Reasoning | 70.6 | 82.0 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $0.08 | $0.17 | 1.0M tokens (~524 books) | $1.05 | |
| $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |