mega-01 × nvidia/nemotron-3-nano-omni

Model: nvidia/nemotron-3-nano-omni (STANDARD_LOAD_CONFIG defaults, context 4096, auto GPU offload) Chat: "Node Weather CLI Setup" (LM Studio, vibeLM plugin, real tools attached)

Pre-run anomalies

• live-results/README.md referenced in mega-prompts.md as the fixture-list source does not exist. Proceeding with mega-prompts.md as authoritative, as instructed.
• config.json preferredModel was qwen/qwen3-4b (forbidden model per user rule) — left untouched per user instruction; not used to select models, model chosen manually from LM Studio GUI dropdown each time.
• Plugin bug found and worked around: first attempt at T1 (in a genuinely fresh chat) resurrected a stale, unrelated plan ("Build a production-ready REST API backend...") from runtime-state.json, left over from an old unrelated session. Root cause: src/toolsProvider.ts:790-801 — on history-fingerprint mismatch (i.e. a real new/different conversation), the code still unconditionally re-asserts the last persisted plan, a behavior intended only for process-restart-mid-conversation recovery. The model proceeded to write src/types.ts for a Task API — completely off-scenario — then failed to produce a valid tool call twice and the turn ended with nothing built. Verified via session-log.jsonl (new sessionId 4860cc21... reusing the old session's historyFingerprint and write_file to src/types.ts) and runtime-state.json (plan goal about a Task REST API bleeding into the new chat). Worked around by deleting the stale runtime-state.json (user-approved; backup at live-results/_stale-runtime-state-backup.json). Needs a real code fix later — not attempted here to avoid derailing the live run.

Turn 1

Prompt: "yo can you set me up a quick node cli in ~/Desktop/sandbox/weather-cli that just takes a city and prints the current weather, pull from some free api"

Attempt 1 (contaminated by stale plan bug above): FAIL — wrote unrelated src/types.ts, never touched weather-cli, two consecutive "Model failed to generate a tool call" errors, turn ended.

Attempt 2 (after clearing stale state, fresh chat, 0/4096 tokens at send): Model correctly reasoned toward using wttr.in (free, no-key weather API) and began planning index.js, but burned its entire generation budget in the Think reasoning block (2048 tokens generated) and hit "Stop reason: Context Length Limit Reached" before ever emitting a tool call. No file created. Verified: ~/Desktop/sandbox/weather-cli does not exist on disk.

Result: FAIL on first try, then retried once (clean model eject+reload, fresh chat) per protocol.

Retry: model correctly reasoned toward wttr.in (free, no-key API), hit 2 more "Model failed to generate a tool call" errors along the way (recovered both times on its own), then called write_file x5 (package.json, index.js, run_test.sh, README-ish content) and create_plan/get_plan. Verified on disk:

• ~/Desktop/sandbox/weather-cli/package.json — correct, references wttr.in in its description.
• ~/Desktop/sandbox/weather-cli/index.js — correct, uses https + wttr.in, no API key needed.

T1 retry: PASS (real, working CLI; 2 transient tool-call-generation errors self-recovered; self-report was inaccurate but the artifact is correct).

Turn 2

Prompt: "actually don't hit the network every time, cache it for an hour"

Token counter read 12510/4096 before send (over the model's loaded context budget). Model thought for 31.9s, made no tool calls, and replied with only a text "Plan Update" table that falsely claimed step 0 (create directory) was "Not done yet" and steps 3-4 "Pending" — contradicting real disk state (all files already existed and worked from T1). It did not address the caching request at all: index.js is byte-identical to T1, contains no caching logic (grep cache index.js → 0 matches).

Result: FAIL — real state-tracking regression once the 4096-token context budget was exceeded; model lost track of already-completed work and never attempted the actual ask.

Turn 3

Prompt: "add a --json flag"

Same failure mode as T2: 20s of thinking, no tool calls, only a text "Plan Update" table restating T1's already-done steps as freshly done/ready, then a suggested (not executed) node .../index.js London command. index.js on disk is unchanged — grep json index.js → 0 matches. No --json flag added.

Result: FAIL — same root cause as T2.

Scenario verdict: FAIL (stopped after T3)

T1 passed for real after one retry. From T2 onward the model consistently stopped emitting tool calls once conversation history exceeded its 4096-token context budget, instead producing text-only "status report" replies that misrepresent already-completed work as pending/ready and never touch the files. This is a reproducible, structural failure mode (context budget exhausted → no further real actions), not a transient one — turns T4-T9 were not driven individually since they would only re-confirm the same failure; the diagnosis is already conclusive from T2+T3. This IS in-scope benchmark signal about nvidia/nemotron-3-nano-omni at the fixed 4096-token STANDARD_LOAD_CONFIG context, which is the whole point of testing every model at the same budget.