Fireworks发布Ember-1：基于Kimi K3优化推理效率

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Introducing Ember-1

PUBLISHED 9/23/2026

Table of Contents

• Ember-1: half the tokens, same answers
• How Fireworks Research built Ember-1
• The problem: thinking models think too much
• From an observation to a premium model
• The Specialized Intelligence Index: Ember-1 sets a Pareto frontier for Bedside Bench
• Evaluating Pareto across more industry benchmarks
• Customer validation: Live A/B tests
• Internal validation: Our own developers didn't notice
• What's next

Table of Contents

Ember-1: half the tokens, same answers

Ember-1 is a new specialized model from Fireworks Research that delivers Kimi K3’s quality with 40% fewer tokens. Built on Kimi K3, it learned to cut unnecessary reasoning while keeping the thinking that matters. We tested it on external benchmarks, in live customer A/B tests, and on our own coding and agent workloads, and quality held up in every setting. Available today, Ember-1 kicks off an ongoing series of specialized models by Fireworks, shaped by what developers want next. Ember is just the start of what you could build with the Fireworks Training platform.

How Fireworks Research built Ember-1

We heard from users that they needed K3’s coding capabilities at a lower cost, because its long reasoning traces made automated coding expensive at scale. Turning down K3's reasoning effort didn't solve this. Lower effort settings gave up too much quality. To keep the quality and cut the tokens, the model had to learn to reason more efficiently, and that meant training it.

Getting there took serious research. Our team ran more than 50 training experiments and over 200 evaluations, and developed new training algorithms along the way to shorten reasoning without losing accuracy. We did it all on Fireworks Serverless Training. Because we didn’t have to provision or manage GPUs, we could launch experiments as soon as we had an idea, pay only for what we ran, and move from research to launch in a fraction of the usual time and cost.

We trained across a broad set of tasks so the token savings would carry over to many workloads. We then evaluated Ember-1 on the Specialized Intelligence Index, public benchmarks, and live production traffic to confirm it used fewer tokens with no drop in quality. Ember-1 is Fireworks’ own model and the first in a series of models from Fireworks Research.

The problem: thinking models think too much

Reasoning models like Kimi K3 spend the majority of their generated tokens, sometimes more than 90%, on internal reasoning rather than the answer itself. This thinking structure is expensive on a single request, but it gets much worse in multi-turn agentic workloads. Every turn replays all prior reasoning back to the model, so context grows roughly quadratically with the number of turns. Long reasoning traces from early turns get re-read (and re-billed) on every subsequent call.

Is all that reasoning actually necessary? Our experiments said no. The reasoning Kimi K3 emits is far longer than the task requires, and the excess can be removed without touching the answer. This was how we created Ember-1, an economical version of Kimi K3 built from specialized intelligence.

From an observation to a premium model

Not all of K3's reasoning is wasted. Some of it is self-reflection: revisiting an assumption, responding to feedback, or tracing an outcome back to an earlier decision can help the model recover from mistakes. The opportunity is to preserve this ability while reducing unnecessary reasoning and escaping unproductive loops. We believe that learning from tasks and environment feedback can teach the model to reason more efficiently while maintaining its capabilities.

For agentic tasks, this learning extends across the interaction. The model explores possible actions, incorporates new observations, and refines its reasoning as it progresses. Feedback connects decisions to their consequences, encouraging useful reflection throughout the task.

We carried these insights into a training collection spanning mathematics, coding, instruction following, conversation, search, tool use, and software engineering, covering both standalone problems and extended interactions to enforce adaptation to observations and outcomes. Task feedback guides on-policy planning and learning, with an emphasis on preserving capability across this range of settings.

Results on public benchmarks and live A/B tests support this direction: across seven benchmarks and two customers’ production traffic, Kimi K3’s reasoning could be shortened by 35–50% without sacrificing accuracy. The internalized behavior also shows restrained token use on unsuccessful attempts, reducing prolonged, unproductive reasoning.

The Specialized Intelligence Index: Ember-1 sets a Pareto frontier for Bedside Bench

Earlier this week, we introduced the Specialized Intelligence Index (SII) to benchmark open, closed, and specialized models against real-world tasks created by industry experts.

We evaluated Ember-1 on Doximity’s Bedside Bench, a physician-validated benchmark spanning 500 clinical cases across 10 specialized categories.

The result? Ember-1 set a new Pareto frontier for Bedside Bench across both open and closed models including GPT-5.6 Sol, GPT-6 Astra, and Claude Opus 5 on cost/task.

Figure 1: Pareto Frontier from SII on Bedside Bench

Figure 2: Score vs. Duration Chart on Bedside Bench SII

Evaluating Pareto across more industry benchmarks

We also evaluated Ember-1 on the quality-vs-cost frontier across some other industry benchmarks. We computed per-benchmark cost using the public Kimi K3 API pricing (uncached input $3/M tokens, cached input $0.30/M, output $15/M) and plotted it against pass rate for three arms: K3 at reasoning effort low, K3 at reasoning effort high, K3 at reasoning effort max (default), and Ember-1. Across every benchmark with more than 50 test samples, Ember-1 sits on or near the Pareto frontier, matching K3-max quality at a fraction of the cost, and strictly dominating K3-low. We also analyzed GPT-6 Astra, Claude Opus-5 and GLM 5.3, and found that Ember-1 was a leader on the Pareto frontier.

Figure 3: Average of 5 Industry Benchmarks on Open and Closed Model Cost/Task

We took a double-click on the results directly comparing Ember-1 to the original K3, and found the following results:

The most cost optimized way to run K3 is no longer to make it think less, but to run Ember-1, the model that learned to think efficiently.

Customer validation: Live A/B tests

Benchmarks only tell you so much. Like what we found in the Specialized Intelligence Index results, we wanted to test the model on more real workloads, and to test the model using production traffic. The real test is often whether the model holds up on production traffic, in products users depend on.

We ran live A/B tests with two customers on their production coding workloads. In both cases, Ember-1 delivered impressive token savings, approximately 35% fewer tokens per task at comparable quality. Most of the downstream product metrics held or improved, including task completion, success scores, and failure rates all moving in the right direction at substantially lower token cost. Following the A/B tests, one customer is now running Ember-1 in live production, with plans to scale it up to replace the base model entirely.