GPT OSS 20B vs Qwen3 Coder Flash
GPT OSS 20B comes out ahead, 61 to 51 on our weighted score, and it is the cheaper option too.
- Our pick
OpenAIGPT OSS 20B
61/100- ECI137.8
- Price$0.07 / $0.25
- Context131K
Alibaba (Qwen)Qwen3 Coder Flash
51/100- ECI—
- Price$0.30 / $1.50
- Context1M
Add a model
Make it a three-way comparison.
GPT OSS 20B is our pick
GPT OSS 20B is the better all-round choice, scoring 61/100 against Qwen3 Coder Flash (51). It leads on price. Qwen3 Coder Flash wins on context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceGPT OSS 20BGPT OSS 20B $0.115 · Qwen3 Coder Flash $0.60 per 1M tokens (3:1 blend)
- Longest contextQwen3 Coder FlashQwen3 Coder Flash 1,000,000 · GPT OSS 20B 131,072 tokens
- Widest inputsSame inputsGPT OSS 20B: Text · Qwen3 Coder Flash: Text
- Self-hostingGPT OSS 20BPublishes downloadable weights
| Measure | Weight | GPT OSS 20B | Qwen3 Coder Flash |
|---|---|---|---|
| Price | 50% | 90 | 58 |
| Inputs & features | 30% | 35 | 35 |
| Context window | 20% | 25 | 60 |
| Overall | 100% | 61/100 | 51/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT OSS 20BOpenAI | Qwen3 Coder FlashAlibaba (Qwen) |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 137.8 | — |
| ECI rank | #122 of 165 | — |
| GPQA DiamondGraduate-level science questions | 60.8% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 65.3% | — |
| Price per million tokens | ||
| Input | $0.07 (best) | $0.30 |
| Output | $0.25 (best) | $1.50 |
| Cached input | — | $0.06 |
| Blended (3:1) | $0.115 (best) | $0.60 |
| Long-context rate | Same rate | Over 32K: $0.50 / $2.50 |
| Price source | Median of 37 providers | Official Alibaba API |
| Limits | ||
| Context window | 131,072 tokens | 1,000,000 tokens (best) |
| Max output | 32,768 tokens | 65,536 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | No |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| Structured output | No | Yes |
| Availability | ||
| Weights | Open | Proprietary |
| API model ID | — | qwen3-coder-flash |
| API providers | 41 (best) | 10 |
| Released | Aug 5, 2025 | Jul 28, 2025 |
| Knowledge cutoff | Jun 2024 | Apr 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT OSS 20B$1.20
- Qwen3 Coder Flash$6.00
Which should you choose?
Which is better: GPT OSS 20B or Qwen3 Coder Flash?
GPT OSS 20B is the better all-round choice, scoring 61/100 against Qwen3 Coder Flash (51). It leads on price. Qwen3 Coder Flash wins on context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, GPT OSS 20B or Qwen3 Coder Flash?
GPT OSS 20B is cheaper at $0.07 input / $0.25 output per million tokens (median across 37 API providers). Qwen3 Coder Flash costs $0.30 input / $1.50 output per million tokens (official Alibaba API price). At a typical mix of three input tokens to one output token, that is $0.115 per million tokens for GPT OSS 20B versus $0.60 for Qwen3 Coder Flash (5.2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. GPT OSS 20B has an ECI of 137.8 and Qwen3 Coder Flash has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT OSS 20B and Qwen3 Coder Flash yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
Qwen3 Coder Flash has the largest context window at 1,000,000 tokens, against 131,072 for GPT OSS 20B. Maximum output per response: GPT OSS 20B up to 32,768, Qwen3 Coder Flash up to 65,536 tokens.
Which can read images, PDFs, audio or video?
GPT OSS 20B accepts text; Qwen3 Coder Flash accepts text. They handle the same number of input types.
Are any of these open source?
GPT OSS 20B publishes its weights and can be self-hosted; Qwen3 Coder Flash is proprietary.
Which is newer?
GPT OSS 20B is the newest, released Aug 5, 2025. Qwen3 Coder Flash came out Jul 28, 2025. Knowledge cutoff: GPT OSS 20B Jun 2024, Qwen3 Coder Flash Apr 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.
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