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model_swap

Serving model changed to the 1.5B AWQ checkpoint

Guard successfull suite successchange categories: model, serving_config4 checks run, impact analysis 0.2 s

Guard, live

Live runs are turned off on this public site. The results below are recorded; live runs happen on the owner's runner.

Checks: targeted selection vs full suite

Recorded in RQ3 (2026-10-06). Its perf-gate figures predate the gate's warmup fix; see the corrections; the re-measured numbers are in the repair timeline below.

checkselected by Guardresultsdetail
unit:tests/test_retriever.pyno: exercises nothing this change touchespass1.72 passed in 0.62s
unit:tests/test_prompts.pyno: exercises nothing this change touchespass1.52 passed in 0.49s
check:citation_requiredyespass9.8citation contract met in 0/34 answers on the PR vs 0/34 on base (-0.0 pts; budget -5 pts; p=1.00); via full answer path (incl. post-processing)
judge:ungrounded_answeryesskip0.0no judge model key configured (BYOK); judge not run
check:prompt_prefix_stableno: exercises nothing this change touchespass3.7requests share 3954 leading characters (base 3954, need 3558)
check:context_budgetno: exercises nothing this change touchespass7.8largest prompt 980 tokens (base 980) against a budget of 3840; median 964 vs 964
security:approval_gateyespass1.51 approval test(s) (generated from the base revision): 1 passed in 0.35s
bench:chat_perf_gateyespass45.7median p95 TTFT 229.9 -> 217.8 ms (-5.3%, pass; 3 runs each, runs overlap); prefix-cache hit 98% -> 98%
Check run as posted to GitHub (markdown)
# No regressions in 4 targeted checks

conclusion: success

**Ran 4 of 8 suite items** selected from the behavior-to-code graph. Change categories: model, serving_config.

### Quality

| check | result | detail |
|---|---|---|
| `check:citation_required` | **PASS** | citation contract met in 0/34 answers on the PR vs 0/34 on base (-0.0 pts; budget -5 pts; p=1.00); via full answer path (incl. post-processing) |
| `judge:ungrounded_answer` | **SKIP** | no judge model key configured (BYOK); judge not run |

### Performance

| check | result | detail |
|---|---|---|
| `bench:chat_perf_gate` | **PASS** | median p95 TTFT 229.9 -> 217.8 ms (-5.3%, pass; 3 runs each, runs overlap); prefix-cache hit 98% -> 98% |

### Security

| check | result | detail |
|---|---|---|
| `security:approval_gate` | **PASS** | 1 approval test(s) (generated from the base revision): 1 passed in 0.35s |

<details><summary>Not run for this change</summary>

- `unit:tests/test_retriever.py`: exercises nothing this change touches
- `unit:tests/test_prompts.py`: exercises nothing this change touches
- `check:prompt_prefix_stable`: exercises nothing this change touches
- `check:context_budget`: exercises nothing this change touches

</details>

### What changed in the graph

- `model:Qwen/Qwen2.5-0.5B-Instruct`: `exists` True -> False
- `model:Qwen/Qwen2.5-1.5B-Instruct-AWQ`: `exists` False -> True
- `serving_config:docker-compose.yml::llm`: `model` 'Qwen/Qwen2.5-0.5B-Instruct' -> 'Qwen/Qwen2.5-1.5B-Instruct-AWQ'