GPT-6 Luna vs Spark X2.6 4B
Task by task
A score turns orange only when that model wins clearly more of the task's test cases. Under each score, the average time per test case on the machine it ran on. Spark X2.6 4B spends 5.0× as many thinking tokens per test case.
TaskAGPT-6 LunaBSpark X2.6 4B
Overall
6149.1s
151m 3s
Agents
561m 18s
141m 32s
Structured Extraction
9514.5s
1039.5s
Coding
732m 18s
41m 8s
Grounded Answers
6715.6s
1050.2s
Instruction Following
8432.3s
371m 29s
Business Logic
3743.1s
1036.3s
Security & permissions
6224.5s
3154.3s
Diagnosis & investigation
1737.7s
01m 30s
What you'd run
The build behind each score. Orange marks the faster, smaller, cheaper or longer-context side.
SpecAGPT-6 LunaBSpark X2.6 4B
Speed
90 tok/s
136 tok/s
Machine
Hosted
RTX 5090, 32 GB
Memory at 32K
—
9.4 GB
Context
1.1M (better)
605K
Cost per run
$0.10 (better)
$1.61 est.
Cost per case
$0.00067 (better)
$0.011 est.
Time per case
49.1s (better)
1m 3s
Quantization
—
BF16
Harness
openrouter
llama.cpp
The race
Each model's running score as the test cases go by. The dashed line is a perfect run.
Every test case
Each square is one test case, colored by the model that scored higher.
Agents
Structured Extraction
Coding
Grounded Answers
Instruction Following
Business Logic
Security & permissions
Diagnosis & investigation