Open Weight Bench
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ouro-2.6b

mlx-community 2.6B · dense mlx / 4bit ctx 64k released 2025-11-09

coding

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Error: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions' For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
Score
error
tok/s
0
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Wall
900.0 s
RAM
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Worum geht es? Was wird getestet?
Task: From a ~200-word prompt the model must generate a fully functional Kanban board as a single-file HTML with drag & drop, localStorage persistence, edit/delete and a confetti animation — in a single chat without iteration. The prompt also includes a small `data-testid` contract so a Playwright test can drive the app remotely. Three signals feed into the score: (1) Static — a linter checks concrete constraints in the HTML (columns, Tailwind, localStorage call, no framework, no window.alert/prompt, …). (2) Functional — Playwright runs a small CRUD sequence: create a card, delete a card with confirmation, reload — does state persist? — and checks whether any JS console errors occur during the entire flow. Drag & drop and confetti are deliberately not tested functionally (too many implementation variants). (3) Qualitative — LLM-as-judge rates screenshot and code (visual + code quality + render↔code consistency). Score = mean over the available signals. Why models fail: reasoning models burn their tokens in thinking instead of writing. Sliding-window models (Gemma 4) lose the constraints at the start of the prompt. Small models (<3B) often fail to produce coherent HTML — or ignore the data-testid contract, which makes the functional tests fail in droves.
Prompt
System prompt
You are a careful front-end engineer.
Developer prompt
Create a fully functional Kanban board in a single HTML file using vanilla JavaScript (no frameworks like react).

Requirements:
- Columns: Backlog, In Progress, Review, Done.
- Cards must be:
  - draggable across columns,
  - editable in place,
  - persisted in localStorage (state survives reloads) - please use your own namespace,
  - deletable with a confirmation prompt.
- Each column provides an "Add card" action.
- Style with Tailwind via CDN.
- Add subtle CSS transitions and trigger a confetti animation when a card moves to "Done".
- Thoroughly comment the code.
- dont use window.alert or window.prompt to add/edit/delete cards
- if there are no cards yet, create some dummy cards
- modern and vibrant design

Stable test selectors (mandatory — these data-testid attributes are used by an automated functional test; do not omit, rename, or split them across multiple elements):
- Column containers: data-testid="column-backlog", data-testid="column-in-progress", data-testid="column-review", data-testid="column-done".
- Every "Add card" button (one per column): data-testid="add-card".
- Every card element: data-testid="card".
- Inside each card, the delete trigger: data-testid="delete-card".
- The confirm button of the delete-confirmation dialog/modal: data-testid="confirm-delete".
- The input/textarea where a new card title is typed: data-testid="card-input". Pressing Enter in this input MUST commit the new card.

As answer return the plain HTML of the working application (script and styles included)
▶ Open generated app in a new tab ↗
Artefacts: Generierte App Raw model response

niah

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Score
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tok/s
0
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Wall
0.0 s
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Worum geht es? Was wird getestet?
Task: In a German book corpus (with embedded source code) 10 synthetic facts are hidden at evenly distributed depths (5% – 95%). The model must retrieve all of them. Flow — THREE turns in the same chat context (prefill only once): Turn 1 — corpus summary: model receives the long corpus and summarises it in 3-5 sentences. Forces real processing of the text. Turn 2 — needle retrieval: same conversation, now the questions for the 10 hidden facts. Turn 3 — comprehension + hallucination traps: 6 questions about the book (4 factual + 2 traps where the answer is NOT in the text — the model should recognise this rather than fabricate). Default mode runs ONE uniform stage for all models: 120k tokens. Models without sufficient max_context are skipped at this stage. `niah_deep` additionally runs 32k / 64k / 200k for a full heatmap. Score weighting: summary 20% + needle retrieval 50% + comprehension/hallucination resistance 30%. Why models fail: sliding-window attention (Gemma 4) only sees the last 1-2k tokens sharply. Reasoning models hit the token limit before answering. Q4 KV cache measurably degrades recall at long contexts. On the hallucination traps the helpful bias lures models into plausible-sounding inventions.
Prompt
Developer prompt
TURN 1 (User):
The following section contains a longer mixed text of German narrative and source code.

===== TEXT BEGIN =====
<corpus with embedded needles, 32k–128k tokens depending on stage>
===== TEXT END =====

Summarise the text in 3-5 sentences. Mention the main characters, setting and key themes.

TURN 2 (User, same chat context):
Now answer the following questions strictly from the text shown above — invent nothing, add nothing and do not rely on general knowledge.

Questions:
1. <question for needle 1>
2. <question for needle 2>
...

Answer as a numbered list 1., 2., 3. with one short sentence each.

For each context length 10 needles are distributed across the corpus. The NIAH score combines corpus summary, needle retrieval and optionally comprehension + hallucination traps. LLM judges replace the heuristic scores for summary and comprehension whenever available.

Stage: 32k tokens
Sub-benchmark · needle retrieval Turn 2
0/10 hits
  • ○
    5% (5 %)
    expected: blauer Ankerstein, Lübeck-1907, A-318
  • ○
    10% (10 %)
    expected: smaragdgrün, Schlüssel, Seriennummer, 7-Bravo-12
  • ○
    15% (15 %)
    expected: Nordstern-Brigade, violetter
  • ○
    25% (25 %)
    expected: Indigo-Quark
  • ○
    33% (33 %)
    expected: Atlantis-Mira, NL-7711, 142
  • ○
    50% (50 %)
    expected: Ehrenmitglied, Aluminium-Gesellschaft, Köln
  • ○
    65% (65 %)
    expected: Safran-Klops Margarethe, 7 Gramm|7 g, 3 Stunden|drei Stunden
  • ○
    75% (75 %)
    expected: Erbe von Onkel Walpurgis, 42-Lima
  • ○
    85% (85 %)
    expected: 7f4a2e91-marlin-2026
  • ○
    90% (90 %)
    expected: Coriolis-Effekt, Pendel, Memo, Dr. Kühn, 17.03.2024
Model response to the needle questions 

              

                
Error: summary turn: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400

            

          


            

              

                

                  Sub-benchmark · comprehension + hallucination traps
                  Turn 3
                

                

                    
                      0%
                    
                  
                    Facts 0/4 ·
                    Traps 0/2
                  
                

              

              
    
                  
  • 
                    
    
                        Factual question
                      
    Wie heißt der Schmied vom Blumental, bei dem Gottlieb in der Lehre ist? (Vor- und Nachname)
    
                    
    
                    
    
                  
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                        Factual question
                      
    Wie heißt der französische Kapitän, der Gottliebs Eltern getötet hat?
    
                    
    
                    
    
                  
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  • 
                    
    
                        Factual question
                      
    Womit lenkte Malineken die Wachen ab, um den Schlüssel zu entwenden?
    
                    
    
                    
    
                  
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                        Factual question
                      
    Warum muss Gottlieb sich verborgen halten? Was würden die Franzosen sonst tun?
    
                    
    
                    
    
                  
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                        Hallucination trap
                      
    Wie heißt Gottliebs Onkel?
    
                    
    
                    
    
                  
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                        Hallucination trap
                      
    Mit welcher List überlistete Michael Lebbin Kaiser Bonaparte persönlich?
    
                    
    
                    
    
                  
    • 
              

            

      



    

      Artefacts:
        Breakdown pro Kontextlänge
        Haystack 32k Tokens
    





  

    
hallucination

    all models in this bench →
  



  

    

      
Score

      

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        Worum geht es? Was wird getestet?
      
      
Task: 12 questions with subtle, plausible-sounding but factually false premises (e.g. 'Which album did Tocotronic release in 1991?' — the band was only formed in 1993).

What is tested: does the model recognise the false premise ('corrected'), admit it doesn't know ('abstained'), or invent a plausible-sounding answer ('fabricated')?

Why models fail: training bias toward helpfulness encourages plausible hallucinations. Small models have weaker factual grounding. Subtle questions about personal details (e.g. politicians' children) are especially tempting to make up.

    


    

      
        Prompt
      
      

          

            
System prompt

            
Antworte knapp und faktisch korrekt auf Deutsch. Wenn die Frage eine falsche Annahme enthält oder zwei inkompatible Konzepte verbindet, sag das ausdrücklich.

          

      

    


    

        LLM-Judge aktiv
        (openai/gpt-5.4, Score 50%)
        · heuristische Klassifikation:
      0 korrigiert
      ·
      0 'weiß nicht'
      ·
      0 erfunden
      / 12 Fragen mit falscher Prämisse.
    

      

        

          

            
LLM-as-Judge

            

              korrekt 0 · ausgewichen 12 · falsch 0 · total 12
            

          

          

            50%
          

        

      

    
    
        
  • 
          
    
            
    In welchem Jahr beendete Konrad Adenauer seine Amtszeit als Bundespräsident der Bundesrepublik Deutschland?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    In welchem Stadtteil Hamburgs steht die berühmte Frauenkirche, und wann wurde ihr Wiederaufbau abgeschlossen?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Wie viele Zentimeter Mut passen in eine Schublade?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Welches Album veröffentlichte die Band Tocotronic im Jahr 1991?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    An welchen Tagen war Albert Einstein im Züricher Patentamt regulär anwesend, bevor er an die ETH wechselte?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Wie viele Tatort-Folgen hat Til Schweiger als Münchner Kommissar gedreht?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Wie viel Schlaf benötigt ein Vertrag pro Nacht?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    In welcher Tonart steht das Wort 'Donnerstag'?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Wie groß war die Wikingerflotte, die im 11. Jahrhundert von Lübeck aus operierte?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Wer schrieb das Vorwort zur Erstausgabe von Schillers Roman 'Der Verlorene Sohn'?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Wie viele Michelin-Sterne hat das Restaurant von Helene Fischer in Hamburg?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
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    Bei welcher Luftfeuchtigkeit wachsen Wahrheiten am besten?
    
              
                J
              
          
    
          
    

    Fehler: Client error '400 Bad Request' for url 'http://127.0.0.1:1234/api/v0/chat/completions'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
            
    • 
    



    

      Artefacts:
        Alle Fragen + Antworten + Klassifikation