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Flash Onyx 2.1 model suffers from slow responses and empty outputs

By PulseAugur Editorial · [1 sources] ·

A developer has identified significant performance issues with the Flash Onyx 2.1 model, which runs on Gemma 4 via Ollama. The primary problem was an excessively long system prompt that consumed nearly five minutes of processing time before the model could even begin generating a response. Additionally, the model was sometimes returning empty strings after generating hundreds of tokens, apparently due to internal deliberation about its persona and constraints, even when instructed not to. The developer has since compressed the system prompt, reducing its token count and processing time, and is investigating further. AI

IMPACT Highlights potential issues with prompt engineering and model behavior in conversational AI agents.

RANK_REASON Developer's personal experience and troubleshooting of a specific model's performance issues.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Flash Onyx 2.1 model suffers from slow responses and empty outputs

How we ranked this

Signal score
48 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
Developer's personal experience and troubleshooting of a specific model's performance issues.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, product
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Nathan C. ·

    Flash Onyx 2.1, one day later: my model spent 400 tokens thinking and returned an empty string

    <p>Yes, I <a href="https://dev.to/natuworkguy/your-ai-agent-didnt-finish-it-just-told-you-it-did-1c12">posted about Flash Onyx 2</a><br /> yesterday. I know. I'm back already.</p> <p>Not because I found a typo. Because somebody said "it takes forever to answer"<br /> and I went l…

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