DeepSeek V3 vs GPT-OSS 20B
Open-weights reasoning at bargain pricing. Meanwhile, gpt-oss 20b: openai's open-weights return.
Side-by-side
Specs
| Dimension | DeepSeek V3 | GPT-OSS 20B |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Released | 2025-05 | 2025-09 |
| Context window | 128K | 128K |
| Output max | 8K | 8K |
| Input /M | $0.27 | ✓$0.15 |
| Output /M | $1.10 | ✓$0.60 |
| Modalities | text | text |
| Open weights | yes | yes |
Scorecard
Dimension-by-dimension
DeepSeek V3
GPT-OSS 20B
reasoning
9.0
7.0
coding
9.0
7.0
writing
7.0
7.0
speed
7.0
9.0
value
10.0
10.0
Verdict
Which wins, by use case
| Use case | Winner | Why |
|---|---|---|
| coding | DeepSeek V3 | a decisive lead on our weighted coding score |
| writing | DeepSeek V3 | a coin flip on our weighted writing score |
| chat | GPT-OSS 20B | a clear edge on our weighted chat score |
| agents | DeepSeek V3 | a decisive lead on our weighted agents score |
| summarization | GPT-OSS 20B | a clear edge on our weighted summarization score |
| translation | GPT-OSS 20B | a coin flip on our weighted translation score |
| reasoning | DeepSeek V3 | a decisive lead on our weighted reasoning score |
| research | DeepSeek V3 | a clear edge on our weighted research score |
| vision and multimodal | DeepSeek V3 | a clear edge on our weighted vision score |
| Cheapest AI models for bulk workloads | GPT-OSS 20B | a clear edge on our weighted cheap-bulk score |
Bottom line
Our take
Pick DeepSeek V3 if you need: strong math & code, very cheap.
Pick GPT-OSS 20B if you need: single-gpu inference, open weights.
At a 500M-input / 150M-output monthly volume, DeepSeek V3 costs roughly $300 vs GPT-OSS 20B at $165. Use our calculator to plug in your own numbers.
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