Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
GPT-5.3-Codex-Spark is clearly ahead on the aggregate, 87 to 66. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.3-Codex-Spark's sharpest advantage is in coding, where it averages 82.3 against 44.8. The single biggest benchmark swing on the page is LiveCodeBench, 80 to 40.
GPT-5.3-Codex-Spark is the reasoning model in the pair, while Qwen2.5-1M is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Qwen2.5-1M gives you the larger context window at 1M, compared with 256K for GPT-5.3-Codex-Spark.
Pick GPT-5.3-Codex-Spark if you want the stronger benchmark profile. Qwen2.5-1M only becomes the better choice if you need the larger 1M context window or you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.3-Codex-Spark
85.6
Qwen2.5-1M
64.7
GPT-5.3-Codex-Spark
82.3
Qwen2.5-1M
44.8
GPT-5.3-Codex-Spark
88.3
Qwen2.5-1M
68.4
GPT-5.3-Codex-Spark
92.7
Qwen2.5-1M
80.9
GPT-5.3-Codex-Spark
78.3
Qwen2.5-1M
60.4
GPT-5.3-Codex-Spark
92
Qwen2.5-1M
84
GPT-5.3-Codex-Spark
90.8
Qwen2.5-1M
80.4
GPT-5.3-Codex-Spark
96.7
Qwen2.5-1M
83.6
GPT-5.3-Codex-Spark is ahead overall, 87 to 66. The biggest single separator in this matchup is LiveCodeBench, where the scores are 80 and 40.
GPT-5.3-Codex-Spark has the edge for knowledge tasks in this comparison, averaging 78.3 versus 60.4. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.3-Codex-Spark has the edge for coding in this comparison, averaging 82.3 versus 44.8. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
GPT-5.3-Codex-Spark has the edge for math in this comparison, averaging 96.7 versus 83.6. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
GPT-5.3-Codex-Spark has the edge for reasoning in this comparison, averaging 92.7 versus 80.9. Inside this category, BBH is the benchmark that creates the most daylight between them.
GPT-5.3-Codex-Spark has the edge for agentic tasks in this comparison, averaging 85.6 versus 64.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
GPT-5.3-Codex-Spark has the edge for multimodal and grounded tasks in this comparison, averaging 88.3 versus 68.4. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
GPT-5.3-Codex-Spark has the edge for instruction following in this comparison, averaging 92 versus 84. Inside this category, IFEval is the benchmark that creates the most daylight between them.
GPT-5.3-Codex-Spark has the edge for multilingual tasks in this comparison, averaging 90.8 versus 80.4. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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