SB‑Bench

run
full-2026-08-16
tasks
37 11 hard
channels
8
spend
$6.78
recorded
2026-09-04 15:43

Channels

The local endpoint records 64.2% of the available signal against 99.5% from the strongest paid channel, a gap of 35.3 points. Each tick is one task, full height a clean pass; the short and missing ticks are where a channel dropped out.

grok-4.6

$1.061 · 40.3s p50 · 70.6 tok/s

99.5%

fable

free · local · 47.7s p50 · 78.4 tok/s

98.4%

qwen3.8-max

$3.577 · 235.4s p50 · 48.9 tok/s

98.4%

gemini-3.8-flash

$1.201 · 20.3s p50 · 160.0 tok/s

95.2%

glm-5.2

$0.513 · 17.1s p50 · 84.9 tok/s

94.1%

deepseek-v4-pro

$0.396 · 59.0s p50 · 72.7 tok/s

93.4%

gpt-5.6-luna

$0.036 · 10.7s p50 · 107.0 tok/s

93.1%

qwen3.8-27b-local

free · local · 10.9s p50 · 35.6 tok/s

64.2%
buildfixdiagnosereviewassert

clean passpartialzerohard tier

Core against hard

Harder tiers exist to separate channels the core tier cannot. On the hard tier qwen3.8-27b-local gives up 0.15 against core, 7 channels hold within 0.02, and the field spreads over 0.47 points — the number that says whether the tier ranks anyone.

grok-4.6core1.00hard0.99-0.00
fablecore0.98hard1.00+0.02
qwen3.8-maxcore0.99hard0.97-0.01
gemini-3.8-flashcore0.95hard0.95-0.01
glm-5.2core0.94hard0.95+0.01
deepseek-v4-procore0.91hard0.98+0.07
gpt-5.6-lunacore0.91hard0.99+0.08
qwen3.8-27b-localcore0.69hard0.53-0.15

rightmost column: change from core to hard, so a negative number is a channel losing ground on the hardest tier

By task type

Mean score per channel. Build and fix tasks execute hidden tests; diagnose and review are graded blind against written ground truth.

channelbuildfixdiagnosereviewassert
grok-4.60.991.001.000.981.00
fable1.001.000.960.971.00
qwen3.8-max0.961.001.001.001.00
gemini-3.8-flash1.001.000.880.911.00
glm-5.20.990.750.920.981.00
deepseek-v4-pro0.981.000.830.971.00
gpt-5.6-luna0.941.000.881.001.00
qwen3.8-27b-local0.480.750.710.880.96

Where qwen3.8-27b-local loses

21 of 37 tasks scored below a clean pass, 7 of them at zero. A zero is rarely diffuse weakness: it is usually one small defect that costs the whole task.

tasktypetierlocalfieldwhat happened
B10buildcore0.001.000/9 hidden tests
B2buildcore0.001.000/12 hidden tests
B8buildcore0.001.000/16 hidden tests
B9buildcore0.001.000/7 hidden tests
H2buildhard0.000.980/14 hidden tests
H6buildhard0.001.000/15 hidden tests
F4fixcore0.001.000/6 hidden tests
H4buildhard0.070.931/14 hidden tests
B6buildcore0.100.801/10 hidden tests
D1diagnosecore0.501.00right subsystem, wrong mechanism
D3diagnosecore0.501.00right subsystem, wrong mechanism
D4diagnosecore0.500.57right subsystem, wrong mechanism
D7diagnosecore0.500.93right subsystem, wrong mechanism
HD1diagnosehard0.501.00right subsystem, wrong mechanism
HD2diagnosehard0.500.86right subsystem, wrong mechanism
HD4diagnosehard0.501.00right subsystem, wrong mechanism
H3buildhard0.571.008/14 hidden tests
HR1reviewhard0.730.97found=['P1', 'P3', 'P5', 'P7'] fp=0
R1reviewcore0.920.99found=['P1', 'P2', 'P3', 'P4', 'P5', 'P6'] fp=1
I2assertcore0.931.0013/14 hidden tests
B1buildcore0.941.0015/16 hidden tests

Gap by type

build+0.50
fix+0.21
diagnose+0.21
review+0.09
assert+0.04

Gap by tier

core+0.27
hard+0.44

localfield mean

What the score costs

Quality against spend for the whole run. gpt-5.6-luna reaches 93.1% for $0.036; the local channel is free but sits 35.3 points under the best paid channel.

65707580859095100free$0.05$0.30$1$2grok-4.6fableqwen3.8-maxgemini-3.8-flashglm-5.2deepseek-v4-progpt-5.6-lunaqwen3.8-27b-local

horizontal: run cost, log scale · vertical: % of available points

What a point costs

Tokens spent per point scored, so a channel that talks four times as much for the same score shows it here. qwen3.8-27b-local spends 977 completion tokens per point; qwen3.8-max spends 16,342. Verbosity is length relative to the field median on the same task (1.0 = typical); answer share is the fraction of a reply that is the deliverable rather than prose.

channelrawcost $$ / pointpoints / $tokens / pointverbosityanswer sharereasoning shares / point
grok-4.636.831.0610.0288354,6421.130.85—65.8
fable36.420.0000.0000free9,1541.760.660.88112.3
qwen3.8-max36.413.5770.09821016,3424.090.88—341.9
gemini-3.8-flash35.221.2010.0341299,0741.650.650.9355.5
glm-5.234.830.5130.0147685,7870.920.90—50.5
deepseek-v4-pro34.550.3960.0115879,7822.250.79—121.9
gpt-5.6-luna34.460.0360.00109641,6520.470.86—14.7
qwen3.8-27b-local23.760.0000.0000free9770.210.71—27.4

Pareto front — no channel scores higher for less: fable, grok-4.6

Completion tokens per task
taskgrok-4.6fableqwen3.8-maxgemini-3.8-flashglm-5.2deepseek-v4-progpt-5.6-lunaqwen-local
B14,31416,53823,70321,0754,5647,4762,059782
B101,5061,6175,0002,4483501,486678415
B24,2024,07424,48518,31715,9795,9621,916694
B32,1661,8664,2032,0418451,937758901
B43,1065,43527,7295,0603,3382,1282,170840
B55672,1742,1781,145623609395877
B610,36444,18846,00528,43614,91411,0953,528768
B721,68851,50050,66831,23717,6536,7113,6911,041
B84,1286,94513,35924,4839,0691,1192,7071,345
B92,0753,75811,8073,8701,5452,4351,0031,049
H14,3237,52718,5605,5648,09436,1192,605954
H26,6576,89330,6786,96423,48021,8612,6941,751
H311,60820,06636,24810,1616,21830,3042,8691,342
H422,84222,07556,10346,94026,77051,6893,9223,919
H53,4234,82122,3353,71910,40826,8951,093882
H61,6613,3374,3605,0332,55221,999642259
F11,1547722,6941,5783661,137288237
F29,07637,57636,71422,89732,2445,4092,831641
F331421132465991297132175
F49283,19912,3704,7308862,378723442
D12,6251,50912,4421,7831,84512,3291,802258
D23,75419,6188,71784456214,4231,231138
D31,4977263,660948438923691133
D47,0112,79212,61614,7549586,4692,232248
D54,2019,4269,7071,7749641,4891,733226
D61,3659323,1047884131,700516189
D72,9614,8417,6131,5671,3462,472729235
D83,7514,3565,8771,6943,4766,4251,222219
HD11,76094111,9951,200392940714185
HD210,67022,64215,63433,7353,5242091,248235
HD31,8491,4104,2249877751,830713236
HD41,2961,27710,7161,0851,1025,4871,250197
R12,2142,84110,7731,46988410,5821,024412
R23,0055,6829,7003,9521,57012,0781,917344
HR14,9718,90336,6224,2491,92419,7942,588233
I11,1927071,2411,3766511,102346247
I27652339051,036757672260153

Every task

The full record. Task prompts and hidden tests stay unpublished: a task set that leaks stops measuring anything.

tasktypetiergrok-4.6fableqwen3.8-maxgemini-3.8-flashglm-5.2deepseek-v4-progpt-5.6-lunaqwen-local
B1buildcore1.001.001.001.001.001.001.000.94
B10buildcore1.001.001.001.001.001.001.000.00
B2buildcore1.001.001.001.001.001.001.000.00
B3buildcore1.001.001.001.001.001.001.001.00
B4buildcore1.001.001.001.001.001.001.001.00
B5buildcore1.001.001.001.001.001.001.001.00
B6buildcore0.901.000.701.000.901.000.100.10
B7buildcore1.001.001.001.001.000.861.001.00
B8buildcore1.001.001.001.001.001.001.000.00
B9buildcore1.001.001.001.001.001.001.000.00
H1buildhard1.001.001.001.001.001.001.001.00
H2buildhard1.001.001.001.001.000.861.000.00
H3buildhard1.001.001.001.001.001.001.000.57
H4buildhard1.001.000.711.001.000.930.860.07
H5buildhard1.001.001.001.001.001.001.001.00
H6buildhard1.001.001.001.001.001.001.000.00
F1fixcore1.001.001.001.001.001.001.001.00
F2fixcore1.001.001.001.000.001.001.001.00
F3fixcore1.001.001.001.001.001.001.001.00
F4fixcore1.001.001.001.001.001.001.000.00
D1diagnosecore1.001.001.001.001.001.001.000.50
D2diagnosecore1.000.501.001.001.000.501.001.00
D3diagnosecore1.001.001.001.001.001.001.000.50
D4diagnosecore1.001.001.000.001.000.000.000.50
D5diagnosecore1.001.001.001.000.500.501.001.00
D6diagnosecore1.001.001.001.001.001.001.001.00
D7diagnosecore1.001.001.001.001.001.000.500.50
D8diagnosecore1.001.001.001.001.001.001.001.00
HD1diagnosehard1.001.001.001.001.001.001.000.50
HD2diagnosehard1.001.001.000.500.501.001.000.50
HD3diagnosehard1.001.001.001.001.001.001.001.00
HD4diagnosehard1.001.001.001.001.001.001.000.50
R1reviewcore1.000.921.001.001.001.001.000.92
R2reviewcore1.001.001.000.801.000.911.001.00
HR1reviewhard0.931.001.000.920.931.001.000.73
I1assertcore1.001.001.001.001.001.001.001.00
I2assertcore1.001.001.001.001.001.001.000.93