Model comparison
o3-pro vs Step 3.5 Flash
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use BenchLM's provisional ranking lane.
Evidence parity. o3-pro and Step 3.5 Flash share 0 comparable benchmark results. 0 of 8 categories are comparable. 2 results are unique to o3-pro; 0 to Step 3.5 Flash.
Updated July 14, 2026- Shared results
- 0
- o3-pro only
- 2
- Step 3.5 Flash only
- 0
- Comparable categories
- 0 / 8
Benchmark data for o3-pro and Step 3.5 Flash is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM does not have sourced benchmark coverage for Step 3.5 Flash yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
o3-pro is priced at $20.00 input / $80.00 output per 1M tokens, versus $0.10 input / $0.30 output per 1M tokens for Step 3.5 Flash. Step 3.5 Flash has the larger context window at 256K, compared with 200K for o3-pro.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | o3-pro | Step 3.5 Flash | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | o3-pro$20 input / $80 output | Step 3.5 Flash$0.1 input / $0.3 output | Step 3.5 Flash has the lower combined listed price. |
| Generation speedtokens per second | o3-pro27 tok/s | Step 3.5 Flash87 tok/s | Step 3.5 Flash has the higher measured throughput. |
| First-answer latencyseconds to first token | o3-pro84.93 s | Step 3.5 Flash3.03 s | Step 3.5 Flash reaches the first token sooner. |
| Context windowmaximum listed tokens | o3-pro200K | Step 3.5 Flash256K | Step 3.5 Flash lists the larger context window. |
Benchmark Deep Dive
Frequently Asked Questions (3)
Can I compare o3-pro and Step 3.5 Flash 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 o3-pro and Step 3.5 Flash today?
o3-pro: $20.00 input / $80.00 output per 1M tokens Step 3.5 Flash: $0.10 input / $0.30 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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