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DeepSeek V4 Flash vs O3 Mini

The readout for DeepSeek V4 Flash and O3 Mini, before the detailed comparison sheet.

Model A

DeepSeek V4 Flash

DeepSeek

Leading
vs

Model B

O3 Mini

OpenAI

Contender

Key Takeaways

Weighted outcome: DeepSeek V4 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

DeepSeek V4 Flash

DeepSeek V4 Flash has the higher weighted result; Model A / B score 68 to 32.

Evidence depth

86 data points

Includes 10 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with DeepSeek V4 Flash

The charts below split 20 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for DeepSeek V4 Flash and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
DeepSeek V4 Flash
O3 Mini
Overall leaderLeadingContender
Weighted overall score68.0 pts32.0 pts
Benchmark category leads3 categories2 categories
Operational advantagesCheapest input price, Average speed, First-token latency, Free providers, Provider coverageNo data
Context window1.0M tokens200K tokens
Max output384K tokens100K tokens
Modalities

Input

Text

Output

Text

Input

TextFile

Output

Text
Features
Text inputText outputTool callingStructured outputsJSON modeReasoning
Text inputFile inputText outputTool callingStructured outputsJSON modeReasoning

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
DeepSeek V4 Flash
O3 Mini
DeveloperDeepSeekOpenAI
ReleasedApr 2026Feb 2025
ParametersNo dataNo data
TokenizerDeepSeekGPT
Knowledge cutoffNo data2023-10-31
OpenRouter IDdeepseek/deepseek-v4-flashopenai/o3-mini
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for DeepSeek V4 Flash and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

DeepSeek V4 Flash

DeepSeek V4 Flash is stronger in benchmark categories (Agents, Coding, Reasoning) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).

O3 Mini

O3 Mini leads these benchmark categories: Knowledge, Math.

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
5 / 8
Model B coverage
6 / 8
Shared
5 shared categories

Avg. score

DeepSeek V4 Flash

43.3

Avg. score

O3 Mini

48.3

Agents

DeepSeek V4 Flash leads by 6.0

DeepSeek V4 Flash45.4
O3 Mini39.4

Coding

DeepSeek V4 Flash leads by 4.7

DeepSeek V4 Flash43.9
O3 Mini39.2

Reasoning

DeepSeek V4 Flash leads by 4.0

DeepSeek V4 Flash53.3
O3 Mini49.3

Knowledge

O3 Mini leads by 6.4

DeepSeek V4 Flash41.4
O3 Mini47.8

Math

O3 Mini leads by 25.9

DeepSeek V4 Flash32.6
O3 Mini58.5

Multilingual

No data

DeepSeek V4 Flash-
O3 Mini-

Multimodal

No data

DeepSeek V4 Flash-
O3 Mini-

Instruction following

O3 Mini

DeepSeek V4 Flash-
O3 Mini55.6

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Aggregatereported

BenchLM overall score

SourceDeepSeek V4 Flash (High)

DeepSeek V4 Flash

51.0

Rank #78/111 · confidence 2 · eval date 2026-07-31

0.0

O3 Mini

51.0

Rank #78/111 · confidence 1 · eval date 2025-01-31

Pricingverified

Output price

SourceDeepSeek V4 Flash (Reasoning, High Effort)

DeepSeek V4 Flash

winner

$0.280/M

Rank #10/186 · confidence 4

+$4.12/M

O3 Mini

$4.40/M

Rank #119/186 · confidence 4

Pricingverified

Blended price

SourceDeepSeek V4 Flash (Reasoning, High Effort)

DeepSeek V4 Flash

winner

$0.168/M

Rank #13/186 · confidence 4

+$1.76/M

O3 Mini

$1.93/M

Rank #118/186 · confidence 4

Pricingverified

Input price

SourceDeepSeek V4 Flash (Reasoning, High Effort)

DeepSeek V4 Flash

winner

$0.130/M

Rank #18/186 · confidence 4

+$0.970/M

O3 Mini

$1.10/M

Rank #117/186 · confidence 4

Reasoningreported

MMLU-Pro

SourceDeepSeek V4 Flash (High)

DeepSeek V4 Flash

winner

86.4%

Rank #17/129 · confidence 2 · eval date 2026-07-31

+7.3%

O3 Mini

79.1%

Rank #70/129 · confidence 4

Reasoningverified

HLE

SourceDeepSeek V4 Flash (Reasoning, High Effort)

DeepSeek V4 Flash

winner

30.3%

Rank #55/216 · confidence 4

+22.4%

O3 Mini

7.9%

Rank #135/216 · confidence 4

Reasoningverified

GPQA

SourceDeepSeek V4 Flash (Reasoning, High Effort)

DeepSeek V4 Flash

winner

86.7%

Rank #56/218 · confidence 4

+11.9%

O3 Mini

74.8%

Rank #122/218 · confidence 4

Codingreported

SWE-bench Verified

SourceDeepSeek V4 Flash (High)

DeepSeek V4 Flash

winner

78.6

Rank #19/49 · confidence 2 · eval date 2026-07-31

+29.3

O3 Mini

49.3

Rank #46/49 · confidence 1 · eval date 2025-01-31

Codingreported

BenchLM Coding score

SourceDeepSeek V4 Flash (High)

DeepSeek V4 Flash

winner

46.0

Rank #65/87 · confidence 2 · eval date 2026-07-31

+24.7

O3 Mini

21.3

Rank #86/87 · confidence 1 · eval date 2025-01-31

Knowledgereported

BenchLM Knowledge score

SourceDeepSeek V4 Flash (High)

DeepSeek V4 Flash

52.8

Rank #69/83 · confidence 2 · eval date 2026-07-31

+12.8

O3 Mini

winner

65.6

Rank #48/83 · confidence 1 · eval date 2025-01-31

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
DeepSeek V4 Flash
O3 Mini
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
DeepSeek V4 Flash
O3 Mini
Jasper45 tests

DeepSeek V4 Flash

speed / latency

96 tok/s / 7428ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

丸美小沐25 tests

DeepSeek V4 Flash

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

66 tok/s / 6491ms

input / output

No data

9527 API10 tests

DeepSeek V4 Flash

speed / latency

31 tok/s / 7293ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

Seamee API10 tests

DeepSeek V4 Flash

speed / latency

143 tok/s / 1761ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

Sub2API10 tests

DeepSeek V4 Flash

speed / latency

49 tok/s / 5413ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

兔子API

DeepSeek V4 Flash

deepseek-v4-flash

speed / latency

No data

input / output

$0/request

O3 Mini

o3-mini-medium

speed / latency

No data

input / output

$0/request

Newagiai

DeepSeek V4 Flash

deepseek-v4-flash

speed / latency

No data

input / output

$0.096/M/$0.192/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

柏拉图AI

DeepSeek V4 Flash

deepseek-v4-flash

speed / latency

No data

input / output

$0.096/M/$0.192/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

KFCV50

DeepSeek V4 Flash

deepseek-v4-flash

speed / latency

No data

input / output

$0.0034/request

O3 Mini

o3-mini

speed / latency

No data

input / output

$0.075/M/$0.301/M

KKSJ-AI

DeepSeek V4 Flash

deepseek-v4-flash

speed / latency

No data

input / output

$0.370/M/$1.11/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0062/request

FAQ

Weighted outcome: DeepSeek V4 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.