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GPT-5.1 vs Seed 1.5-VL
Comprehensive side-by-side LLM comparison
GPT-5.1 leads with 8.4% higher average benchmark score. Overall, GPT-5.1 is the stronger choice for coding tasks.
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OpenAI
GPT-5.1, released by OpenAI in November 2025, is a large language model from the GPT-5 family that delivers incremental improvements in reasoning, instruction following, and multimodal understanding over GPT-5. It features a 400K token context window and targets general-purpose development, long-context analysis, and agentic workflows.
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ByteDance
Seed1.5-VL, released by ByteDance Seed on May 15, 2025, is a vision-language foundation model composed of a 532M-parameter vision encoder and a Mixture-of-Experts language model with 20 billion active parameters. It was pretrained on over 3 trillion multimodal tokens and achieved state-of-the-art performance on 38 out of 60 public VLM benchmarks at release. Seed1.5-VL targets complex visual reasoning, OCR, video comprehension, 3D spatial understanding, and multimodal agentic tasks.
5 months newer
Seed 1.5-VL
ByteDance
2025-05-15
GPT-5.1
OpenAI
2025-11
Average performance across 1 common benchmarks
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GPT-5.1
Average Score:76.0%(+8.4%)
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Seed 1.5-VL
Average Score:67.6%
Performance comparison across key benchmark categories
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GPT-5.1
Multimodal76.0%(+8.4%)
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Seed 1.5-VL
Multimodal67.6%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1
0 providers
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Seed 1.5-VL
0 providers
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GPT-5.1
Avg Score:76.0%(+8.4%)
Providers:0
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Seed 1.5-VL
Avg Score:67.6%
Providers:0