Model Comparison
Reka Flash 3
vs. Step 3.5 Flash 2603
Comparing 2 AI models · 12 benchmarks · Reka AI, StepFun
Recommended Pick
St Step 3.5 Flash 2603 17 metric wins Strongest on: Value, Input price, Output price
Best Value
Step 3.5 Flash 2603
100.0 value score
47.9 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash 2603
$0.10/1M input price
Best Reasoning
Step 3.5 Flash 2603
47.9 reasoning score
Blends available reasoning benchmarks
Best for Coding
Step 3.5 Flash 2603
34.6 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 2.0x cheaper on input tokens than Reka Flash 3.
Speed gap
Step 3.5 Flash 2603 generates about 2.1x as many tokens per second as Reka Flash 3.
Reasoning gap
Step 3.5 Flash 2603 leads Reka Flash 3 by 8.6 points on reasoning.
Coding gap
Step 3.5 Flash 2603 leads Reka Flash 3 by 25.7 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Reka Flash 3
Reka AI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Step 3.5 Flash 2603
StepFun
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Re Reka Flash 3 | Top Pick St Step 3.5 Flash 2603 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.20/1M | $0.10/1M |
| Output Cost | $0.80/1M | $0.30/1M |
| Blended (3:1) | $0.35/1M | $0.15/1M |
| Specifications | ||
| Organization | Reka AI | StepFun |
| Release Date | Mar 10, 2025 | Apr 2, 2026 |
| Performance & Speed | ||
| Throughput | 92.3 tok/s | 195.0 tok/s |
| TTFT | 1801ms | 1102ms |
| Latency | 23462ms | 11358ms |
| Composite Indices | ||
| Value Score | 35.2 | 100.0 |
| Reasoning Score | 39.3 | 47.9 |
| Intelligence | 9.5 | 38.5 |
| Coding | 8.9 | 34.6 |
| Math | 33.7 | — |
| Standard Benchmarks | ||
| GPQA | 52.9% | 82.6% |
| MMLU Pro | 66.9% | — |
| HLE | 5.1% | 22.6% |
| LiveCodeBench | 43.5% | — |
| MATH 500 | 89.3% | — |
| AIME 2025 | 33.7% | — |
| AIME (Original) | 51.0% | — |
| SciCode | 26.7% | 38.5% |
| LCR | 0.0% | 54.3% |
| IFBench | 30.4% | 66.5% |
| TAU-bench v2 | 0.0% | 87.4% |
| TerminalBench Hard | 0.0% | 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.
Step 3.5 Flash 2603 has the strongest reasoning profile with a 47.9 reasoning score, combining the available reasoning-heavy benchmarks.
Step 3.5 Flash 2603 reaches a 34.6 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
Reka Flash 3
- General-purpose AI
- Versatile applications
Step 3.5 Flash 2603
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
