I spent a weekend testing all 8 major AI models through a single API gateway. Here are the real results.

Models Tested (May 2026)

Model Provider Best For

GPT-5.5 OpenAI General-purpose flagship

GPT-5.5 Pro OpenAI Heavy lifting

Claude Opus 4.7 Anthropic Deep reasoning, creative writing

Claude Sonnet 4.6 Anthropic Code generation (95% first-pass pass rate)

DeepSeek V4 Pro DeepSeek Best Chinese open-source model

DeepSeek V4 Flash DeepSeek Budget-friendly fast inference

Gemini 2.5 Pro Google Multimodal tasks

Qwen3 Max Alibaba Chinese language understanding

Key Findings

Code: Claude Sonnet 4.6 leads with 95% first-run pass rate. GPT-5.5 follows at 92%.

Reasoning: Claude Opus 4.7 scored a perfect 5.0/5.0 on logic puzzles. DeepSeek V4 Pro is close behind at 4.8.

Creative Writing: Claude Opus 4.7 excels here. GPT-5.5 is great but slightly more formulaic.

Chinese Language: Qwen3 Max has the deepest Chinese understanding.…