Data points: 136
The readout for DeepSeek V4 Flash and GPT-5.3 Codex, before the detailed comparison sheet.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex currently has the stronger profile, with verified wins split 2 to 4.
Evidence depth
136 data points
Includes 28 benchmark rows, 3 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 41 high-signal samples across speed, scores, and audit health.
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.
Model compare DeepSeek V4 Flash vs GPT-5.3 Codexdeepseek-v4-flash-vs-gpt-5-3-codex | Model A DeepSeek V4 Flash | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Free providers, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
DeepSeek V4 Flash
68
Avg. score
GPT-5.3 Codex
67.1
Selected category
Multimodal
DeepSeek V4 Flash leads by 10.7
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
DeepSeek V4 Flash
70.0
Rank #23/82 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner85.0
Rank #8/82 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
winner$0.280/M
Rank #2/95 · confidence 4
GPT-5.3 Codex
$14.00/M
Rank #75/95 · confidence 4
DeepSeek V4 Flash
winner$0.175/M
Rank #6/95 · confidence 4
GPT-5.3 Codex
$4.81/M
Rank #75/95 · confidence 4
DeepSeek V4 Flash
winner$0.140/M
Rank #10/95 · confidence 4
GPT-5.3 Codex
$1.75/M
Rank #69/95 · confidence 4
DeepSeek V4 Flash
62.7
Rank #29/57 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner74.0
Rank #4/57 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
3.4
Rank #21/44 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner16.9
Rank #6/44 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
86.7%
Rank #22/103 · confidence 4
GPT-5.3 Codex
winner91.5%
Rank #6/103 · confidence 4
DeepSeek V4 Flash
27.8%
Rank #20/103 · confidence 4
GPT-5.3 Codex
winner39.9%
Rank #8/103 · confidence 4
DeepSeek V4 Flash
78.6
Rank #11/28 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner85.0
Rank #4/28 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
39.8
Rank #24/61 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner53.1
Rank #5/61 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
38.6
Rank #23/59 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner53.0
Rank #5/59 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
42.0
Rank #30/63 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner53.2
Rank #7/63 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
42.0%
Rank #37/101 · confidence 4
GPT-5.3 Codex
winner53.2%
Rank #8/101 · confidence 4
DeepSeek V4 Flash
52.3
Rank #17/20 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner56.8
Rank #9/20 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
81.6
Rank #14/69 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner86.7
Rank #10/69 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
35.5
Rank #23/58 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner51.8
Rank #3/58 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
86.7
Rank #19/63 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner91.5
Rank #4/63 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
27.8
Rank #17/63 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner39.9
Rank #5/63 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
37.4
Rank #24/66 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner44.3
Rank #6/66 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
61.8
Rank #33/67 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner91.2
Rank #7/67 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
winner89.7
Rank #9/58 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
86.9
Rank #16/58 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
winner1254.0
Rank #20/46 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
1206.0
Rank #30/46 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
73.5
Rank #12/60 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner75.4
Rank #8/60 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
56.6
Rank #17/24 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner77.3
Rank #3/24 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
winner95.6
Rank #9/58 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
86.0
Rank #21/58 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
54.4
Rank #13/36 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner57.5
Rank #10/36 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
winner62.3
Rank #12/57 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
60.5
Rank #17/57 · confidence 1 · eval date 2026-02-05
DeepSeek V4 Flash
60.6
Rank #24/69 · confidence 2 · eval date 2026-04-24
GPT-5.3 Codex
winner76.9
Rank #12/69 · confidence 1 · eval date 2026-02-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | GPT-5.3 Codex |
|---|---|---|
Winner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 92 100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | DeepSeek V4 Flash | GPT-5.3 Codex |
|---|---|---|
50 tests | DeepSeek V4 Flash speed / latency 57 tok/s / 30314ms input / output No data |
This report only uses LMSpeed data for DeepSeek V4 Flash and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | DeepSeek V4 Flash | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | DeepSeek V4 Flash DeepSeek V4 Flash is stronger when you prioritize Free providers, Recent tests. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Average speed, First-token latency, Provider coverage. |
TL;DR: GPT-5.3 Codex leads across 136 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from DeepSeek V4 Flash vs GPT-5.3 Codex into nearby model comparisons with enough verified LMSpeed data.
| Cheapest input price, Average speed, First-token latency, Provider coverage |
| Model metadata | DeepSeek V4 Flash exposes 1.0M tokens; notable signals: Text input, Text output, Tool calling, Structured outputs. | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | DeepSeek | OpenAI |
| Context window | 1.0M tokens | 400K tokens |
| Max output | 16.4K tokens | 128K tokens |
| Released | Apr 2026 | Feb 2026 |
| Modalities | Input Text Output Text | Input TextImageFile Output Text |
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | DeepSeek | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | deepseek/deepseek-v4-flash | openai/gpt-5.3-codex |
| References | No data | No data |
GPT-5.3 Codex gpt-5.3-codex No audit yet |
猫羽霖APIWinner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 85 787984100 | GPT-5.3 Codex gpt-5.3-codex No audit yet |
|---|
MyDamoxingWinner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 84 787584100 | GPT-5.3 Codex gpt-5.3-codex No audit yet |
|---|
GPT-5.3 Codex
speed / latency
N/A / N/A
input / output
No data
星见雅 API40 tests | DeepSeek V4 Flash speed / latency 47 tok/s / 10092ms input / output No data | GPT-5.3 Codex speed / latency 38 tok/s / 4553ms input / output No data |
|---|
小水管 API30 tests | DeepSeek V4 Flash speed / latency 83 tok/s / 5114ms input / output No data | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
|---|
UoCode25 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 56 tok/s / 4621ms input / output No data |
|---|
6i2 API15 tests | DeepSeek V4 Flash speed / latency 307 tok/s / 3427ms input / output No data | GPT-5.3 Codex speed / latency 89 tok/s / 12856ms input / output No data |
|---|
DeepSeek V4 Flash deepseek-ai/deepseek-v4-flash speed / latency No data input / output $0/M / $0/M | GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $1.75/M / $14.00/M |
DeepSeek V4 Flash deepseek-v4-flash-free speed / latency No data input / output $0/M / $0/M | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $1.80/M / $14.42/M |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M / $0/M | GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $75.00/M / $600.00/M |
DeepSeek V4 Flash deepseek-v4-flash-free speed / latency No data input / output $0.0007/M / $0.0007/M | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $0.182/M / $0.182/M |
DeepSeek V4 Flash daipai/deepseek-v4-flash speed / latency No data input / output $0.0010/M / $0.0010/M | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $1.75/M / $14.00/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
