Kimi K3.1 Pro vs Step 3.5 Flash
Price, context window & benchmark comparison
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Verdict: Step 3.5 Flash is 26.7× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix. Kimi K3.1 Pro has the larger context window (1M vs 262K).
| Kimi K3.1 Pro | Step 3.5 Flash | |
|---|---|---|
| Input price / 1M | $2.00 | $0.10 |
| Output price / 1M | $10.00 | $0.30 |
| Blended price (3:1) | $4.00 | $0.15 |
| Cached input / 1M | $0.20 | — |
| Context window | 1M | 262K |
| Max output | 944K | 66K |
| Intelligence index | 46.5 | — |
| Coding index | — | — |
| Providers | 23 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | No |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-10-23 | 2026-01-29 |
| Retirement | — | — |
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FAQ
Which is cheaper, Kimi K3.1 Pro or Step 3.5 Flash?
Step 3.5 Flash is 26.7× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix.
Kimi K3.1 Pro vs Step 3.5 Flash: which has a bigger context window?
Kimi K3.1 Pro: 1,048,576 tokens. Step 3.5 Flash: 262,144 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Kimi K3.1 Pro ≈ $9,000, Step 3.5 Flash ≈ $350.00.
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