The Known Good Updated 29 Jul 2026
DeepSeek: DeepSeek V3 vs OpenAI: GPT-5 Nano ·DeepSeek vs OpenAI

DeepSeek: DeepSeek V3 vs OpenAI: GPT-5 Nano — head-to-head comparison

DeepSeek: DeepSeek V3 profile OpenAI: GPT-5 Nano profile All comparisons
DeepSeek: DeepSeek V3 — DeepSeek
Quality
#40 of 62
62based on 4 of 7 evaluations
Known Good Index
Speed
#285 of 317
19.3
Output tokens per second
Price
#110 of 370
$0.35
Blended per 1M tokens
In $0.20 · Out $0.80
Cache hit price
#11 of 238
$0.003
per 1M tokens (−99%)
Context
#255 of 375
164k
tokens (~300 pages)
OpenAI: GPT-5 Nano — OpenAI
Quality
#32 of 62
67based on 4 of 7 evaluations
Known Good Index
Speed
#47 of 317
97.5
Output tokens per second
Price
#58 of 370
$0.14
Blended per 1M tokens
In $0.05 · Out $0.40
Cache hit price
#14 of 238
$0.005
per 1M tokens (−90%)
Context
#120 of 375
400k
tokens (~600 pages)
Summary

On the Known Good Index, DeepSeek: DeepSeek V3 scores 62 and OpenAI: GPT-5 Nano scores 67 — a 5-point lead for OpenAI: GPT-5 Nano. They share 3 published evaluations, with DeepSeek: DeepSeek V3 ahead on 1 and OpenAI: GPT-5 Nano ahead on 2.

Blended pricing is $0.35 per 1M tokens for DeepSeek: DeepSeek V3 and $0.14 for OpenAI: GPT-5 Nano — OpenAI: GPT-5 Nano is about 2.5× cheaper.

Throughput is 19 tokens per second for DeepSeek: DeepSeek V3 and 98 for OpenAI: GPT-5 Nano, with time to first token at 1.4s and 2.3s. DeepSeek: DeepSeek V3 accepts 164k tokens of context against 400k.

DeepSeek: DeepSeek V3 is open weights under Open weights (unrestricted); OpenAI: GPT-5 Nano is proprietary. 5 tracked hosts serve one or both.

Generated from tracked data on 29 Jul 2026 · how these comparisons are computed →

At a glance
MetricDeepSeek: DeepSeek V3OpenAI: GPT-5 Nano
Known Good Index 62 based on 4 of 7 evaluations 67 based on 4 of 7 evaluations
Blended $/1M $0.35 $0.14
Output tok/s 19 98
Context window 164k 400k
Providers 3 2
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Quality

Known Good Index and the capability indices, side by side

Index scores

Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.

MetricDeepSeek: DeepSeek V3OpenAI: GPT-5 Nano
Known Good Index 62 67
Mathematics Index 57 89
Reasoning Index 61 —
Agentic Index — 21
Openness Index 60 5
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = DeepSeek: DeepSeek V3 · marker = OpenAI: GPT-5 Nano · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond71 / 69
Mock AIME 2024–2549 / 81
MATH Level 565 / 95

Right-hand figures read DeepSeek: DeepSeek V3 / OpenAI: GPT-5 Nano. DeepSeek: DeepSeek V3 leads on 1 of 3, OpenAI: GPT-5 Nano on 2.

The Known Good

Arena Elo

Human preference rating from blind pairwise votes

Arena ratings

Elo from blind pairwise votes, ingested from Arena. Higher is better.

MetricDeepSeek: DeepSeek V3OpenAI: GPT-5 Nano
Text Arena 1,333 —
Text Arena (style controlled) 1,359 —
The Known Good

Price & Cost

Published API pricing by token type

Published pricing

USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.

MetricDeepSeek: DeepSeek V3OpenAI: GPT-5 Nano
Input $/1M $0.20 $0.05
Output $/1M $0.80 $0.40
Blended $/1M $0.35 $0.14
Cache read $/1M $0.003 $0.005
The Known Good
We publish blended price rather than cost-per-task. Cost-per-task requires token counts from an evaluation suite we do not run. Blended price is computed from published rates and is fully reproducible — see the pricing methodology.

Context Window

Maximum input accepted and maximum output emitted

Context and output limits

Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.

MetricDeepSeek: DeepSeek V3OpenAI: GPT-5 Nano
Context window 164k 400k
Max output tokens 16k 128k
The Known Good

Speed & Latency

Median throughput and time to first token across hosting providers

Output speedTime to first token
Throughput and latency

Medians across all tracked providers, derived from OpenRouter endpoint telemetry.

MetricDeepSeek: DeepSeek V3OpenAI: GPT-5 Nano
Output tokens/s 19 98
Time to first token 1.4s 2.3s
The Known Good

Providers

Which hosts serve each model, and at what price and speed

5 hosts
Full provider benchmarks →
Provider DeepSeek: DeepSeek V3 blendedDeepSeek: DeepSeek V3 tok/s OpenAI: GPT-5 Nano blendedOpenAI: GPT-5 Nano tok/s
StreamLake $0.35 21 — —
Novita $0.62 20 — —
DeepInfra $0.46 12 — —
OpenAI · first party — — $0.07 186
Azure · first party — — $0.14 58

Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.

The Known Good
Sources for this page
Pricing & providers — OpenRouter Metadata — models.dev Benchmarks — Epoch AI (CC-BY 4.0)Elo — Arena Full attribution →