Seed 1.6 vs GPT-5.1 Chat
Seed 1.6 comes out ahead, 55 to 38 on our weighted score, and it is the cheaper option too.
- Our pick
ByteDance SeedSeed 1.6
55/100- ECI—
- Price$0.119 / $1.19
- Context256K
OpenAIGPT-5.1 Chat
38/100- ECI—
- Price$1.25 / $10.00
- Context128K
Add a model
Make it a three-way comparison.
Seed 1.6 is our pick
Seed 1.6 is the better all-round choice, scoring 55/100 against GPT-5.1 Chat (38). It leads on price and context window. GPT-5.1 Chat wins on inputs & features. 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 priceSeed 1.6Seed 1.6 $0.386 · GPT-5.1 Chat $3.44 per 1M tokens (3:1 blend)
- Longest contextSeed 1.6Seed 1.6 256,000 · GPT-5.1 Chat 128,000 tokens
- Widest inputsGPT-5.1 ChatSeed 1.6: Text · GPT-5.1 Chat: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Seed 1.6 | GPT-5.1 Chat |
|---|---|---|---|
| Price | 50% | 69 | 24 |
| Inputs & features | 30% | 45 | 70 |
| Context window | 20% | 36 | 24 |
| Overall | 100% | 55/100 | 38/100 |
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 | Seed 1.6ByteDance Seed | GPT-5.1 ChatOpenAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.119 (best) | $1.25 |
| Output | $1.19 (best) | $10.00 |
| Cached input | $0.024 | — |
| Blended (3:1) | $0.386 (best) | $3.44 |
| Long-context rate | Over 32K: $0.178 / $2.37 | Same rate |
| Price source | Official Volcengine Ark API | Median of 2 providers |
| Limits | ||
| Context window | 256,000 tokens (best) | 128,000 tokens |
| Max output | 64,000 tokens (best) | 16,384 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yesminimal · low · medium · high | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | doubao-seed-1-6-251015 | — |
| API providers | 2 | 2 |
| Released | Oct 15, 2025 | Nov 13, 2025 |
| Knowledge cutoff | — | Sep 30, 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Seed 1.6$3.56
- GPT-5.1 Chat$32.50
Which should you choose?
Which is better: Seed 1.6 or GPT-5.1 Chat?
Seed 1.6 is the better all-round choice, scoring 55/100 against GPT-5.1 Chat (38). It leads on price and context window. GPT-5.1 Chat wins on inputs & features. 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, Seed 1.6 or GPT-5.1 Chat?
Seed 1.6 is cheaper at $0.119 input / $1.19 output per million tokens (official Volcengine Ark API price). GPT-5.1 Chat costs $1.25 input / $10.00 output per million tokens (median across 2 API providers). At a typical mix of three input tokens to one output token, that is $0.386 per million tokens for Seed 1.6 versus $3.44 for GPT-5.1 Chat (8.9× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Seed 1.6 has not been scored yet and GPT-5.1 Chat has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Seed 1.6 and GPT-5.1 Chat 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?
Seed 1.6 has the largest context window at 256,000 tokens, against 128,000 for GPT-5.1 Chat. Maximum output per response: Seed 1.6 up to 64,000, GPT-5.1 Chat up to 16,384 tokens.
Which can read images, PDFs, audio or video?
Seed 1.6 accepts text; GPT-5.1 Chat accepts text and images. GPT-5.1 Chat handles the widest range of inputs.
Are any of these open source?
No. Seed 1.6 and GPT-5.1 Chat are proprietary and only available through APIs and apps.
Which is newer?
GPT-5.1 Chat is the newest, released Nov 13, 2025. Seed 1.6 came out Oct 15, 2025. Knowledge cutoff: GPT-5.1 Chat Sep 30, 2024.
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 Oct 4, 2026.
