DeepSeek V4 Flash vs GPT-5.2 Codex

Name: DeepSeek V4 Flash
Author: DeepSeek

DeepSeek V4 Flash (2026) and GPT-5.2 Codex (2025) compare a standalone API model against a coding-specialized model. DeepSeek V4 Flash ships a 1m-token context window, while GPT-5.2 Codex ships a 400k-token context window. On SWE-bench Verified, DeepSeek V4 Flash leads by 6.2 pts. On pricing, DeepSeek V4 Flash ranges from $0.22 to $0.44/1M input tokens by tier; GPT-5.2 Codex costs $1.75/1M input tokens. This page treats the result as workflow and deployment fit, not a universal model winner.

Treat this as a product-type comparison: DeepSeek V4 Flash is standalone API model, while GPT-5.2 Codex is coding-specialized model. Choose based on workflow fit before reading any benchmark or price row as decisive.

Decision scorecard

Local evidence first

Signal	DeepSeek V4 Flash	GPT-5.2 Codex	How to read it
Product type	Standalone API model	Coding-specialized model	Read downstream rows through the product-type lens before comparing benchmarks, prices, or provider availability.
Best for	reasoning-heavy apps, tool-calling agents, and long-context analysis	custom coding agents, code generation, and tool loops	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	Coding, RAG, and Agents	Coding, RAG, and Agents	Primary workload tags from local decision data.
Context window	1m	400k	Higher is better when prompts, retrieval chunks, or transcripts are large.
Cheapest output	$0.12/1M tokens	$14/1M tokens	Cheapest tracked provider route; verify your exact region and tier.
Provider routes	5 tracked	2 tracked	Broader coverage can reduce vendor lock-in and fallback risk.
Shared benchmarks	SWE-bench Verified leader	3 shared	Visible benchmark lead is 6.2 points on SWE-bench Verified.

Decision tradeoffs

Choose DeepSeek V4 Flash when...

DeepSeek V4 Flash holds a shared-benchmark lead on SWE-bench Verified, ahead by 6.2 points.
DeepSeek V4 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
DeepSeek V4 Flash has the lower cheapest tracked output price at $0.12/1M tokens.
DeepSeek V4 Flash has broader tracked provider coverage for fallback and route flexibility.
Local decision data tags DeepSeek V4 Flash for Coding, RAG, and Agents.

Choose GPT-5.2 Codex when...

GPT-5.2 Codex holds a shared-benchmark lead on SWE-bench Pro, ahead by 3.8 points.
GPT-5.2 Codex uniquely exposes Vision, Multimodal, and Code execution in local model data.
Local decision data tags GPT-5.2 Codex for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate DeepSeek V4 Flash

Requests / monthInput tokens / requestOutput tokens / request

DeepSeek V4 Flash

$76.26

Cheapest tracked route/tier: OpenRouter

GPT-5.2 Codex

$4,900

Cheapest tracked route/tier: Vercel AI Gateway

Estimated monthly gap: $4,824. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

DeepSeek V4 Flash -> GPT-5.2 Codex

Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
GPT-5.2 Codex is $13.88/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
GPT-5.2 Codex adds Vision, Multimodal, and Code execution in local capability data.

GPT-5.2 Codex -> DeepSeek V4 Flash

Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
DeepSeek V4 Flash is $13.88/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Check replacement coverage for Vision, Multimodal, and Code execution before moving production traffic.

Specs

Specification	DeepSeek V4 Flash DeepSeek	GPT-5.2 Codex OpenAI
Released	2026-04-24	2025-12-18
Context window	1m	400k
Parameters	284B	—
Architecture	Mixture of Experts	Decoder Only
License	MITOSI-approved	Proprietary
Openness	Open source	Proprietary
Weights	Available	Not released
Code	Unknown	Unknown
Commercial use	Commercial use: permitted	Commercial use: conditional
Knowledge cutoff	-	2025-08

Pricing and availability

Pricing attribute	DeepSeek V4 Flash	GPT-5.2 Codex
Input price	Off-peak $0.22/1M tokens All UTC hours outside DeepSeek's peak windows. Cache-hit input: $0.007 per 1M tokens; cache-miss input: $0.22 per 1M; output: $0.66 per 1M. Peak $0.44/1M tokens 01:00-04:00 and 06:00-10:00 UTC. Cache-hit input: $0.014 per 1M tokens; cache-miss input: $0.44 per 1M; output: $1.32 per 1M.	$1.75/1M tokens
Output price	Off-peak $0.66/1M tokens All UTC hours outside DeepSeek's peak windows. Cache-hit input: $0.007 per 1M tokens; cache-miss input: $0.22 per 1M; output: $0.66 per 1M. Peak $1.32/1M tokens 01:00-04:00 and 06:00-10:00 UTC. Cache-hit input: $0.014 per 1M tokens; cache-miss input: $0.44 per 1M; output: $1.32 per 1M.	$14/1M tokens
Providers	DeepSeek Platform OpenRouter Microsoft Foundry Vercel AI Gateway Novita AI	Vercel AI Gateway OpenAI API

Capabilities

Capability	DeepSeek V4 Flash	GPT-5.2 Codex
Vision	No	Yes
Multimodal	No	Yes
Reasoning	Yes	Yes
JSON / Tool use	Yes	Yes
Structured outputs	Yes	Yes
Code execution	No	Yes
IDE integration	No	No
Computer use	No	No
Parallel agents	No	No

Benchmarks

Benchmark	DeepSeek V4 Flash	GPT-5.2 Codex
SWE-bench Verified	79.0	72.8
SWE-bench Pro	52.6	56.4
Terminal-Bench 2.0	56.9	64.0

Continue comparing

Model pages

Labs and families

Related comparisons

Popular comparisons for DeepSeek V4 Flash

Popular comparisons for GPT-5.2 Codex

Last reviewed: 2026-07-03. Data sourced from public model cards and provider documentation.

Both models

DeepSeek V4 Flash GPT-5.2 Codex