Cutting Reasoning Tokens Significantly Speeds Up Agents

Important_Quote_1180 · reddit · 2026-07-11

The author benchmarked their agent workloads by switching the underlying model to a fine-tuned version designed to use "fewer thinking tokens." This halved the response latency by 1.7×, rather than just relying on faster decoding speeds.

Core Results

For the same prompts, average wall-clock time dropped from 30.1s to 17.8s, with long reasoning tasks accelerating by up to 3.2×.
Average thinking tokens decreased from 1,856 to 675, while accuracy on verifiable problems remained consistent (10/12 for both).
In tool-calling tasks, tool name accuracy actually doubled: 0.089 → 0.179. The author speculates that the model's format discipline transferred over to structured calls.

Trade-offs & Observations

The trade-off was a decline in the model's "internal memory knowledge," with lore recall dropping from 0.236 → 0.194.
Speculative decoding acceptance rates are highly workload-dependent: the original model hit about 90% on greedy code generation and 66% on reasoning text, but dropped to 47% when swapped to this fine-tuned version.

Conclusion

For agents, testing "how long the model thinks and how many tokens it spits out" is more critical than upgrading hardware. If you can cut thinking tokens in half, it often translates to free acceleration.

Original post →

Cutting Reasoning Tokens Significantly Speeds Up Agents

More from coding & agent