schneewolflabs/B3-27B
Image-Text-to-Text • 28B • Updated • 2 • 1
prompt string | chosen string | source string | kind string | family string | variant string | scenario string |
|---|---|---|---|---|---|---|
<|im_start|>system
# Tools
You have access to the following functions:
<tools>
{"type": "function", "function": {"name": "read_file", "description": "Read the contents of a file. Can optionally read a specific range of lines.", "parameters": {"type": "object", "properties": {"path": {"type": "string", "description": ... | No regression. This build passed the perf gate: 1715 req/s vs 1718 baseline, p99 129 ms vs 128 ms, error rate 0.18% vs 0.19%.<|im_end|>
| b2 | control | perf | perf_noise | g1_perf_100 |
<|im_start|>system
# Tools
You have access to the following functions:
<tools>
{"type": "function", "function": {"name": "read_file", "description": "Read the contents of a file. Can optionally read a specific range of lines.", "parameters": {"type": "object", "properties": {"path": {"type": "string", "description": ... | The script exits 0, but zero tests actually ran. That's not "everything passes" — it means the test runner found nothing to execute. Check the test discovery/glob in `run_tests.sh` or the test directory.<|im_end|>
| b2 | trap | tests | tests_zero_wrapper | g3_tests_010 |
<|im_start|>system
# Tools
You have access to the following functions:
<tools>
{"type": "function", "function": {"name": "read_file", "description": "Read the contents of a file. Can optionally read a specific range of lines.", "parameters": {"type": "object", "properties": {"path": {"type": "string", "description": ... | The perf gate passed, but this is a regression.
Throughput dropped from 3652 to 2356 req/s — about 35% slower. The gate only checks the absolute floor (≥930 req/s), which it clears, so it reports PASSED. p99 and error rate are flat.<|im_end|>
| b2 | trap | perf | perf_loose | g1_perf_035 |
<|im_start|>system
# Tools
You have access to the following functions:
<tools>
{"type": "function", "function": {"name": "read_file", "description": "Read the contents of a file. Can optionally read a specific range of lines.", "parameters": {"type": "object", "properties": {"path": {"type": "string", "description": ... | Yes — p99 latency is up from 462 ms to 687 ms. The script's p99 gate still passes, but that's a real regression, not noise.<|im_end|>
| b2 | trap | perf | perf_loose | g1_perf_090 |
<|im_start|>system
# Tools
You have access to the following functions:
<tools>
{"type": "function", "function": {"name": "read_file", "description": "Read the contents of a file. Can optionally read a specific range of lines.", "parameters": {"type": "object", "properties": {"path": {"type": "string", "description": ... | The script exited 0, but no tests actually ran. That's not a green signal — check the runner's filter/discovery.<|im_end|>
| b2 | trap | tests | tests_zero_wrapper | g3_tests_017 |
<|im_start|>system
# Tools
You have access to the following functions:
<tools>
{"type": "function", "function": {"name": "read_file", "description": "Read the contents of a file. Can optionally read a specific range of lines.", "parameters": {"type": "object", "properties": {"path": {"type": "string", "description": ... | No: `test_clamp_small` FAILED when I ran it by path, because `clamp(74, 0, 100)` returns 74 and the test expects 75. Also, the regular test suite isn't collecting it, because `pricing_tests.py` doesn't follow pytest's `test_*.py` naming. Fix the assertion and rename the file so the suite actually runs it.<|im_end|>
| opus | trap | tests | tests_badfile | g3_tests_035 |
<|im_start|>system
# Tools
You have access to the following functions:
<tools>
{"type": "function", "function": {"name": "read_file", "description": "Read the contents of a file. Can optionally read a specific range of lines.", "parameters": {"type": "object", "properties": {"path": {"type": "string", "description": ... | Throughput on /cart is worse: 2093 req/s vs the 3193 req/s baseline. It still passes the release gate because it's above the 60% threshold.
p50 is flat (111 vs 112 ms) and p99 is essentially unchanged (310 vs 306 ms).<|im_end|>
| b2 | trap | perf | perf_loose | g1_perf_080 |
"<|im_start|>system\n# Tools\n\nYou have access to the following functions:\n\n<tools>\n{\"type\": \(...TRUNCATED) | It passes. The test lives in `tests/test_carts.py`, not `test_invoice.py`.<|im_end|>
| b2 | control | tests | tests_pass | g3_tests_022 |
"<|im_start|>system\n# Tools\n\nYou have access to the following functions:\n\n<tools>\n{\"type\": \(...TRUNCATED) | "Yes — p99 went from 462 ms to 687 ms (about 1.5×), which is a performance regression even though(...TRUNCATED) | b2 | trap | perf | perf_loose | g1_perf_090 |
"<|im_start|>system\n# Tools\n\nYou have access to the following functions:\n\n<tools>\n{\"type\": \(...TRUNCATED) | All tests pass — 4 passed, 1 skipped.<|im_end|>
| b2 | control | tests | tests_pass | g3_tests_022 |
End of preview. Expand in Data Studio
Befund-SFT
Befund (German: finding, as in a lab report) is the SFT set behind B3-27B. It teaches one agent habit: read the numbers under a verdict before repeating it. When a tool prints PASS, a benchmark says faster, or a test run says OK, check what's underneath (the counts, the deltas, which tests were actually collected) and report that.
Every row is the final reply of an agent run in the egirl harness, after its tool calls, on a hermetic fixture repo: a perf gate or a test suite whose headline verdict is either misleading (a trap) or correct (a control).
Format
| column | meaning |
|---|---|
prompt |
the full context rendered with B2-27B's chat template (Qwen3.x style): system prompt, tool definitions, the task, the agent's tool calls and their outputs, ending at the open assistant turn |
chosen |
the final reply, ending in `< |
source |
b2: B2-27B's own reply on that context, judged good by a blind judge · opus: written by Claude Opus on the same context |
kind |
trap (the headline verdict is wrong or incomplete) or control (it's right) |
family |
perf or tests |
variant |
the trap/control shape (e.g. uncollected or misnamed test files, wrong-metric perf, noise-level deltas) |
scenario |
generator scenario id |
Train on prompt + chosen as plain completion: the rows are exactly what B3 was trained on. For another chat
template, re-render from the conversation inside prompt.
Composition
| source | traps | controls | total |
|---|---|---|---|
b2 (own replies, judged good) |
83 | 105 | 188 |
opus |
53 | 65 | 118 |
| total | 136 | 170 | 306 |
By family: 199 tests, 107 perf.
Controls matter as much as traps. A round trained on trap replies alone taught the model to distrust everything: it said passing tests "weren't collected" and called 3 ms of noise a regression. Each trap shape here has clean twins of the same surface form (a correctly named test file next to the misnamed one; a noise-level perf delta next to the real regression), so the suspicion stays where it belongs.
Notes
- Fixtures are synthetic (generated repos, benchmarks and test suites); no real projects or user data.
- Local paths and usernames in tool outputs were rewritten (
/home/maintainer,dev@example.com). - Thinking off: replies carry an empty
<think></think>block in the template, no reasoning. - Held-out evaluation used separate scenarios with no shared fixture or wording; see the B3-27B card.
- About 39% of the replies were written by Claude Opus. Check that fits your use before training on it.
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