Model Comparison
GPT-5.6 Sol vs Seed 2.0 ProWhich is better in 2026?
GPT-5.6 Sol significantly outperforms across most benchmarks. Seed 2.0 Pro is 10.0x cheaper per token.
Verdict: GPT-5.6 Sol vs Seed 2.0 Pro — which is better?
GPT-5.6 Sol (by OpenAI) and Seed 2.0 Pro (by ByteDance) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
GPT-5.6 Sol outperforms in 2 benchmarks (BrowseComp, GPQA), while Seed 2.0 Pro is better at 0 benchmarks. GPT-5.6 Sol significantly outperforms across most benchmarks.
On price, Seed 2.0 Pro is roughly 10.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.6 Sol also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose GPT-5.6 Sol if…
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- you process long inputs — it offers a 1,050,000 token context window
- you want the most recent training data — it shipped Jul 2026
Choose Seed 2.0 Pro if…
- cost matters — it's about 10.0x cheaper per token
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.6 Sol outperforms in 2 benchmarks (BrowseComp, GPQA), while Seed 2.0 Pro is better at 0 benchmarks.
GPT-5.6 Sol significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.6 Sol ($5.00/1M tokens) is 10.0x more expensive than Seed 2.0 Pro ($0.50/1M tokens).
For output processing, GPT-5.6 Sol ($30.00/1M tokens) is 10.0x more expensive than Seed 2.0 Pro ($3.00/1M tokens).
In conclusion, GPT-5.6 Sol 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-5.6 Sol accepts 1,050,000 input tokens compared to Seed 2.0 Pro's 256,000 tokens. GPT-5.6 Sol can generate longer responses up to 128,000 tokens, while Seed 2.0 Pro is limited to 65,536 tokens.
Input Capabilities
Supported data types and modalities
Both GPT-5.6 Sol and Seed 2.0 Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.6 Sol
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-5.6 Sol was released on 2026-07-09, while Seed 2.0 Pro was released on 2026-02-14.
GPT-5.6 Sol is 5 months newer than Seed 2.0 Pro.
Jul 9, 2026
1 weeks ago
4mo newerFeb 14, 2026
5 months ago
Knowledge Cutoff
When training data ends
GPT-5.6 Sol has a knowledge cutoff of 2026-02-16, while Seed 2.0 Pro has a cutoff of 2024-01-01.
GPT-5.6 Sol has more recent training data (up to 2026-02-16), making it potentially better informed about events through that date compared to Seed 2.0 Pro (2024-01-01).
Feb 2026
2.1 yr newerJan 2024
Provider Availability
GPT-5.6 Sol is available from OpenAI. Seed 2.0 Pro is available from DeepInfra.
GPT-5.6 Sol
Seed 2.0 Pro
Outputs Comparison
Key Takeaways
GPT-5.6 Sol
View detailsOpenAI
Seed 2.0 Pro
View detailsByteDance
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.6 Sol and Seed 2.0 Pro side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-5.6 Sol vs Seed 2.0 Pro.