Model Comparison
Step 3.5 Flash
vs. GPT-5.6 Sol (max)
Comparing 2 AI models · 7 benchmarks · StepFun, OpenAI
Recommended Pick
OpGPT-5.6 Sol (max)8 metric winsStrongest on: Reasoning, Intelligence, GPQA
Best Value
Step 3.5 Flash
100.0 value score
42.6 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash
$0.10/1M input price
Best Reasoning
GPT-5.6 Sol (max)
66.7 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.6 Sol (max)
77.4 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Step 3.5 Flash has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Step 3.5 Flash is 50x cheaper on input tokens than GPT-5.6 Sol (max).
Speed gap
Step 3.5 Flash generates about 2.9x as many tokens per second as GPT-5.6 Sol (max).
Reasoning gap
GPT-5.6 Sol (max) leads Step 3.5 Flash by 24.2 points on reasoning.
Top-pick rationale
GPT-5.6 Sol (max) wins 8 measurable categories, including Reasoning, Intelligence, GPQA, HLE.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Step 3.5 Flash
StepFun
TTFT
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Time
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tok/s
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Tokens
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Cost
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GPT-5.6 Sol (max)
OpenAI
TTFT
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Time
—
tok/s
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Tokens
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Cost
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Which answer was more useful?
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Full Comparison
| Metric | St Step 3.5 Flash | Top Pick Op GPT-5.6 Sol (max) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | $5.00/1M |
| Output Cost | $0.30/1M | $30.00/1M |
| Blended (3:1) | $0.15/1M | $11.25/1M |
| Specifications | ||
| Organization | StepFun | OpenAI |
| Release Date | Feb 2, 2026 | Jul 9, 2026 |
| Performance & Speed | ||
| Throughput | 217.4 tok/s | 73.9 tok/s |
| TTFT | 738ms | 83641ms |
| Latency | 9940ms | 83641ms |
| Composite Indices | ||
| Value Score | 100.0 | 2.1 |
| Reasoning Score | 42.6 | 66.7 |
| Intelligence | 25.5 | 58.9 |
| Coding | — | 77.4 |
| Standard Benchmarks | ||
| GPQA | 83.1% | 94.1% |
| HLE | 19.1% | 47.2% |
| SciCode | 40.4% | 56.1% |
| LCR | 43.0% | 73.7% |
| IFBench | 64.6% | 72.7% |
| TAU-bench v2 | 94.4% | 85.1% |
| TerminalBench Hard | 27.3% | 65.9% |
Key Takeaways
Step 3.5 Flash offers the best value at $0.10/1M,making it ideal for high-volume applications and cost-conscious projects.
GPT-5.6 Sol (max) has the strongest reasoning profile with a 66.7 reasoning score,combining the available reasoning-heavy benchmarks.
GPT-5.6 Sol (max) reaches a 77.4 coding index,making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Step 3.5 Flash
- Cost-sensitive applications
- High-volume processing
GPT-5.6 Sol (max)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
