GPT-5.2 Pro vs Leanstral

Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.

Benchmark data for one or both models is coming soon. This page currently shows metadata and pricing where BenchLM has it, and score-level comparisons will populate as public benchmark results land.

BenchLM does not have sourced benchmark coverage for Leanstral yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.

GPT-5.2 Pro is priced at $25.00 input / $150.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Leanstral. GPT-5.2 Pro has the larger context window at 400K, compared with 256K for Leanstral.

Quick Verdict

Benchmark data for GPT-5.2 Pro and Leanstral is coming soon on BenchLM.

Agentic

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

77.9%
BrowseComp
Coming soon

Coding

GPT-5.2 Pro

GPT-5.2 Pro

50.8

Leanstral

21.9

50.8%
SWE-bench Pro
Coming soon
76.3%
SWE-bench Verified
Coming soon
Coming soon
FLTEval
21.9%

Multimodal & Grounded

Coming soon

Benchmark data for this category is coming soon.

Reasoning

Coming soon

Benchmark data for this category is coming soon.

Knowledge

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

93.2%
GPQA
Coming soon
36.6%
HLE
Coming soon

Instruction Following

Coming soon

Benchmark data for this category is coming soon.

Multilingual

Coming soon

Benchmark data for this category is coming soon.

Mathematics

Coming soon

Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.

100%
HMMT Feb 2025
Coming soon
100%
AIME 2025
Coming soon

Frequently Asked Questions

Can I compare GPT-5.2 Pro and Leanstral on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.

Why does this comparison show “coming soon”?

BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.

What data is available for GPT-5.2 Pro and Leanstral today?

GPT-5.2 Pro: $25.00 input / $150.00 output per 1M tokens Leanstral: $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.

Last updated: March 17, 2026

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