Seed 2.1 Turbo vs GPT-5.3 Codex
bytedance/seed-2-1-turbo · openai/gpt-5.3-codex
As of November 2, 2026, GPT-5.3 Codex is the cheaper API on UberLLM: $0.1921 per million input tokens and $1.54 per million output, versus $0.3050 / $1.52 for Seed 2.1 Turbo, about 2% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose GPT-5.3 Codex to cut cost; choose Seed 2.1 Turbo when its capabilities fit your task better.
Seed 2.1 Turbo vs GPT-5.3 Codex, side by side
| Spec | Seed 2.1 Turbo | GPT-5.3 Codex |
|---|---|---|
| Price · input / 1M | $0.3050 | $0.1921 |
| Price · output / 1M | $1.52 | $1.54 |
| Context length | 256,000 | 400,000 |
| Max output tokens | 65,536 | 128,000 |
| Input modalities | text, image, video | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 39% off | 89% off |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 2, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
Seed 2.1 Turbo vs GPT-5.3 Codex — FAQ
Is Seed 2.1 Turbo or GPT-5.3 Codex cheaper?
GPT-5.3 Codex is cheaper on a blended token mix, by about 2%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between Seed 2.1 Turbo and GPT-5.3 Codex?
Seed 2.1 Turbo: $0.3050 in / $1.52 out per 1M tokens. GPT-5.3 Codex: $0.1921 in / $1.54 out per 1M tokens. That's roughly a 2% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Seed 2.1 Turbo and GPT-5.3 Codex with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.