Model Comparison
Step 3.5 Flash 2603
vs. Grok 4.6 (high)
Comparing 2 AI models · 7 benchmarks · StepFun, SpaceXAI
Recommended Pick
SpGrok 4.6 (high)7 metric winsStrongest on: Throughput, Reasoning, Intelligence
Best Value
Step 3.5 Flash 2603
100.0 value score
44.5 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash 2603
$0.10/1M input price
Best Reasoning
Grok 4.6 (high)
66.2 reasoning score
Blends available reasoning benchmarks
Best for Coding
Grok 4.6 (high)
76.8 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 2603 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Step 3.5 Flash 2603 is 20x cheaper on input tokens than Grok 4.6 (high).
Reasoning gap
Grok 4.6 (high) leads Step 3.5 Flash 2603 by 21.7 points on reasoning.
Top-pick rationale
Grok 4.6 (high) wins 7 measurable categories, including Throughput, Reasoning, Intelligence, GPQA.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Step 3.5 Flash 2603
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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Grok 4.6 (high)
SpaceXAI
TTFT
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Time
—
tok/s
—
Tokens
—
Cost
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Which answer was more useful?
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Full Comparison
| Metric | St Step 3.5 Flash 2603 | Top Pick Sp Grok 4.6 (high) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | $2.00/1M |
| Output Cost | $0.30/1M | $6.00/1M |
| Blended (3:1) | $0.15/1M | $3.00/1M |
| Specifications | ||
| Organization | StepFun | SpaceXAI |
| Release Date | Apr 2, 2026 | Aug 12, 2026 |
| Performance & Speed | ||
| Throughput | — | 58.2 tok/s |
| TTFT | — | 45246ms |
| Latency | — | 45246ms |
| Composite Indices | ||
| Value Score | 100.0 | 7.4 |
| Reasoning Score | 44.5 | 66.2 |
| Intelligence | 26.5 | 60.9 |
| Coding | — | 76.8 |
| Standard Benchmarks | ||
| GPQA | 82.6% | 94.9% |
| HLE | 24.5% | 42.9% |
| SciCode | 38.5% | 53.6% |
| LCR | 60.3% | 75.0% |
| IFBench | 66.5% | — |
| TAU-bench v2 | 87.4% | — |
| TerminalBench Hard | 32.6% | — |
Key Takeaways
Step 3.5 Flash 2603 offers the best value at $0.10/1M,making it ideal for high-volume applications and cost-conscious projects.
Grok 4.6 (high) has the strongest reasoning profile with a 66.2 reasoning score,combining the available reasoning-heavy benchmarks.
Grok 4.6 (high) reaches a 76.8 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 2603
- Cost-sensitive applications
- High-volume processing
Grok 4.6 (high)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
