Compare · ModelsLive · 2 picked · head to head
gpt-oss-20b vs Step 3.5 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Step 3.5 Flash wins on 1/1 benchmarks
Step 3.5 Flash wins 1 of 1 shared benchmarks. Leads in arena.
Category leads
arena·Step 3.5 Flash
Hype vs Reality
Attention vs performance
gpt-oss-20b
#22 by perf·no signal
Step 3.5 Flash
#7 by perf·#11 by attention
Best value
gpt-oss-20b
2.1x better value than Step 3.5 Flash
gpt-oss-20b
792.9 pts/$
$0.09/M
Step 3.5 Flash
384.5 pts/$
$0.20/M
Vendor risk
Mixed exposure
One or more vendors flagged
OpenAI
$840.0B·Tier 1
StepFun
$5.0B·Tier 1
Head to head
1 benchmark · 2 models
gpt-oss-20bStep 3.5 Flash
Chatbot Arena Elo · Overall
Step 3.5 Flash leads by +73.7
gpt-oss-20b
1317.7
Step 3.5 Flash
1391.4
Full benchmark table
| Benchmark | gpt-oss-20b | Step 3.5 Flash |
|---|---|---|
Chatbot Arena Elo · Overall | 1317.7 | 1391.4 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| gpt-oss-20b | $0.03 | $0.14 | 131K tokens (~66 books) | $0.57 |
| Step 3.5 Flash | $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 |
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