Data points: 141
The readout for DeepSeek V4 Flash and GPT-OSS, before the detailed comparison sheet.
Decision read
DeepSeek V4 Flash
DeepSeek V4 Flash currently has the stronger profile, with verified wins split 4 to 2.
Evidence depth
141 data points
Includes 27 benchmark rows, 3 audit samples, and 9 provider examples.
Selection signal
Start with DeepSeek V4 Flash
The charts below split 39 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-OSSdeepseek-v4-flash-vs-gpt-oss | Model A DeepSeek V4 Flash | Model B GPT-OSS |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 4 wins | 2 wins |
| Where it leads | Cheapest input price, Free providers, Provider coverage, 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-OSS
57.1
Selected category
Agents
DeepSeek V4 Flash leads by 17.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
DeepSeek V4 Flash
winner70.0
Rank #23/82 · confidence 2 · eval date 2026-04-24
GPT-OSS
34.0
Rank #60/82 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner$0.280/M
Rank #2/95 · confidence 4
GPT-OSS
$0.600/M
Rank #15/95 · confidence 4
DeepSeek V4 Flash
winner$0.175/M
Rank #6/95 · confidence 4
GPT-OSS
$0.262/M
Rank #13/95 · confidence 4
DeepSeek V4 Flash
winner$0.140/M
Rank #10/95 · confidence 4
GPT-OSS
$0.150/M
Rank #13/95 · confidence 4
DeepSeek V4 Flash
winner86.4%
Rank #12/74 · confidence 2 · eval date 2026-04-24
GPT-OSS
77.5%
Rank #53/74 · confidence 4
DeepSeek V4 Flash
winner27.8%
Rank #20/103 · confidence 4
GPT-OSS
5.2%
Rank #73/103 · confidence 4
DeepSeek V4 Flash
winner3.4
Rank #21/44 · confidence 2 · eval date 2026-04-24
GPT-OSS
1.1
Rank #31/44 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner86.7%
Rank #22/103 · confidence 4
GPT-OSS
67.2%
Rank #73/103 · confidence 4
DeepSeek V4 Flash
winner62.7
Rank #29/57 · confidence 2 · eval date 2026-04-24
GPT-OSS
50.7
Rank #41/57 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner88.4%
Rank #4/70 · confidence 2 · eval date 2026-04-24
GPT-OSS
70.7%
Rank #25/70 · confidence 4
DeepSeek V4 Flash
winner81.6
Rank #14/69 · confidence 2 · eval date 2026-04-24
GPT-OSS
21.2
Rank #61/69 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner38.6
Rank #23/59 · confidence 2 · eval date 2026-04-24
GPT-OSS
23.5
Rank #43/59 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner39.8
Rank #24/61 · confidence 2 · eval date 2026-04-24
GPT-OSS
28.6
Rank #41/61 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner42.0
Rank #30/63 · confidence 2 · eval date 2026-04-24
GPT-OSS
38.9
Rank #40/63 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner42.0%
Rank #37/101 · confidence 4
GPT-OSS
36.0%
Rank #65/101 · confidence 4
DeepSeek V4 Flash
89.7
Rank #9/58 · confidence 2 · eval date 2026-04-24
GPT-OSS
winner91.2
Rank #4/58 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner27.8
Rank #17/63 · confidence 2 · eval date 2026-04-24
GPT-OSS
18.5
Rank #33/63 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner86.7
Rank #19/63 · confidence 2 · eval date 2026-04-24
GPT-OSS
78.2
Rank #40/63 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner35.5
Rank #23/58 · confidence 2 · eval date 2026-04-24
GPT-OSS
21.5
Rank #49/58 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner37.4
Rank #24/66 · confidence 2 · eval date 2026-04-24
GPT-OSS
23.8
Rank #43/66 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner61.8
Rank #33/67 · confidence 2 · eval date 2026-04-24
GPT-OSS
44.5
Rank #52/67 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner1254.0
Rank #20/46 · confidence 2 · eval date 2026-04-24
GPT-OSS
1011.0
Rank #44/46 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner73.5
Rank #12/60 · confidence 2 · eval date 2026-04-24
GPT-OSS
69.0
Rank #26/60 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner95.6
Rank #9/58 · confidence 2 · eval date 2026-04-24
GPT-OSS
65.8
Rank #39/58 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner62.3
Rank #12/57 · confidence 2 · eval date 2026-04-24
GPT-OSS
37.9
Rank #38/57 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner54.4
Rank #13/36 · confidence 2 · eval date 2026-04-24
GPT-OSS
29.6
Rank #34/36 · confidence 1 · eval date 2025-08-05
DeepSeek V4 Flash
winner60.6
Rank #24/69 · confidence 2 · eval date 2026-04-24
GPT-OSS
34.6
Rank #53/69 · confidence 1 · eval date 2025-08-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | DeepSeek V4 Flash | GPT-OSS |
|---|---|---|
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-OSS |
|---|---|---|
155 tests | DeepSeek V4 Flash speed / latency 23 tok/s / 14357ms input / output No data |
This report only uses LMSpeed data for DeepSeek V4 Flash and GPT-OSS: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | DeepSeek V4 Flash | GPT-OSS |
|---|---|---|
| When to choose each model | DeepSeek V4 Flash DeepSeek V4 Flash is stronger when you prioritize Cheapest input price, Free providers, Provider coverage, Recent tests. | GPT-OSS GPT-OSS is stronger when you prioritize Average speed, First-token latency. |
TL;DR: DeepSeek V4 Flash leads across 141 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from DeepSeek V4 Flash vs GPT-OSS into nearby model comparisons with enough verified LMSpeed data.
| Average speed, First-token latency |
| Model metadata | DeepSeek V4 Flash exposes 1.0M tokens; notable signals: Text input, Text output, Tool calling, Structured outputs. | GPT-OSS exposes 131.1K tokens; notable signals: Text input, Text output, Tool calling, Reasoning. |
|---|---|---|
| Developer | DeepSeek | No data |
| Context window | 1.0M tokens | 131.1K tokens |
| Max output | 16.4K tokens | 131.1K tokens |
| Released | Apr 2026 | Aug 2025 |
| Modalities | Input Text Output Text | Input Text Output Text |
| Features | Text inputText outputTool callingStructured outputsJSON modeReasoning | Text inputText outputTool callingReasoning |
| Parameters | No data | 120B |
| Tokenizer | DeepSeek | GPT |
| Knowledge cutoff | No data | 2024-06-30 |
| OpenRouter ID | deepseek/deepseek-v4-flash | openai/gpt-oss-120b:free |
| References | No data | No data |
GPT-OSS gpt-oss-120b No audit yet |
猫羽霖APIWinner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 85 787984100 | GPT-OSS openai/gpt-oss-120b No audit yet |
|---|
小水管 APIWinner: DeepSeek V4 Flash | DeepSeek V4 Flash deepseek-v4-flash Audit score 83 807280100 | GPT-OSS gpt-oss-20b Audit score 79 648468100 |
|---|
GPT-OSS
speed / latency
154 tok/s / 963ms
input / output
No data
OpenRouter45 tests | DeepSeek V4 Flash speed / latency 88 tok/s / 3315ms input / output No data | GPT-OSS speed / latency 41 tok/s / 2851ms input / output No data |
|---|
素墨API35 tests | DeepSeek V4 Flash speed / latency N/A / N/A input / output No data | GPT-OSS speed / latency 347 tok/s / 2670ms input / output No data |
|---|
小水管 API25 tests | DeepSeek V4 Flash speed / latency 83 tok/s / 5114ms input / output No data | GPT-OSS speed / latency 216 tok/s / 1311ms input / output No data |
|---|
星见雅 API25 tests | DeepSeek V4 Flash speed / latency 47 tok/s / 10092ms input / output No data | GPT-OSS speed / latency 164 tok/s / 1247ms input / output No data |
|---|
DeepSeek V4 Flash deepseek-ai/deepseek-v4-flash speed / latency No data input / output $0/M / $0/M | GPT-OSS openai/gpt-oss-120b speed / latency No data input / output $1.00/M / $1.00/M |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M / $0/M | GPT-OSS openai/gpt-oss-120b speed / latency No data input / output $100.00/M / $1000.00/M |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M / $0/M | GPT-OSS openai/gpt-oss-20b speed / latency No data input / output $0/M / $0/M |
DeepSeek V4 Flash deepseek-v4-flash speed / latency No data input / output $0/M / $0/M | GPT-OSS gpt-oss:120b speed / latency No data input / output $0/M / $0/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
