gemini-3.5-flash vs kimi-k2.5

Capability for the money

gemini-3.5-flash is 2.8× dearer for 6.1 points on following instructions (IFBench) — worth it only if that is your bottleneck.

1. Following instructions

   extraction, classification, sticking to a format

   IFBench
   gemini-3.5-flash76.3%

   kimi-k2.570.2%

   gemini-3.5-flash +6.1

2. Tool use

   multi-step agent work against real tools

   τ²-bench
   gemini-3.5-flash95.3%

   kimi-k2.595.9%

   kimi-k2.5 +0.6

3. Hard reasoning

   graduate-level science and multi-step analysis

   GPQA Diamond
   gemini-3.5-flash92.2%

   kimi-k2.587.9%

   gemini-3.5-flash +4.3

Averaged over the benchmarks both models sat, kimi-k2.5 returns 70.6 points of pass rate per dollar of blended price against 26.1 — the ratio that decides whether the dearer model earns its rate.

Each figure is a pass rate: the share of that test set the model answered correctly, measured by a third party rather than self-reported by the lab. Rows are different tests of different difficulty, so compare a model against the other model, not one row against the next. No published coding score for one of these models, so that lens is omitted. And a benchmark is not your workload — it narrows the shortlist, it does not pick for you.