GPT-5.1 vs Seed 2.0 Pro
GPT-5.1 and Seed 2.0 Pro are closely matched at 36.6 and 39.4 on the LLM Stats Score. Seed 2.0 Pro is 3.1x cheaper per token.
OpenAI · ByteDance · Updated for 2026
Which is better?
GPT-5.1 and Seed 2.0 Pro are closely matched on the overall LLM Stats Score at 36.6 and 39.4.
In the 3 individual benchmarks reported for both models, Seed 2.0 Pro wins 3; this is a narrower head-to-head signal than the composite indexes.
On price, Seed 2.0 Pro is roughly 3.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.1 also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.1
- you process long inputs — it offers a 400,000 token context window
Choose Seed 2.0 Pro
- you value its reported benchmark strengths — it wins 3 of 3 exact shared results
- cost matters — it's about 3.1x cheaper per token
- you want the most recent training data — it shipped Feb 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
9 reported for GPT-5.1 · 6 for Seed 2.0 Pro
GPT-5.1 outperforms in 0 benchmarks, while Seed 2.0 Pro is better at 3 benchmarks (AIME 2025, GPQA, SWE-Bench Verified).
Seed 2.0 Pro significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.1 ($1.25/1M tokens) is 2.5x more expensive than Seed 2.0 Pro ($0.50/1M tokens).
For output processing, GPT-5.1 ($10.00/1M tokens) is 3.3x more expensive than Seed 2.0 Pro ($3.00/1M tokens).
In conclusion, GPT-5.1 is more expensive than Seed 2.0 Pro.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.1 accepts 400,000 input tokens compared to Seed 2.0 Pro's 256,000 tokens. GPT-5.1 can generate longer responses up to 128,000 tokens, while Seed 2.0 Pro is limited to 65,536 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-5.1 and Seed 2.0 Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.1
Seed 2.0 Pro
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-5.1 was released on 2025-11-13, while Seed 2.0 Pro was released on 2026-02-14.
Seed 2.0 Pro is 3 months newer than GPT-5.1.
Nov 13, 2025
9 months ago
Feb 14, 2026
6 months ago
3mo newerKnowledge Cutoff
When training data ends
GPT-5.1 has a knowledge cutoff of 2024-09-30, while Seed 2.0 Pro has a cutoff of 2024-01-01.
GPT-5.1 has more recent training data (up to 2024-09-30), making it potentially better informed about events through that date compared to Seed 2.0 Pro (2024-01-01).
Sep 2024
8 mo newerJan 2024
Provider Availability
GPT-5.1 is available from OpenAI. Seed 2.0 Pro is available from DeepInfra.
GPT-5.1
Seed 2.0 Pro
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.1 and Seed 2.0 Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.1 vs Seed 2.0 Pro.