Step 5
StepFun
Challenger- Intelligence43.7
- Hallucination43%
- Context1M
- KnowledgeN/D
- Speed87tok/s
- Response31.6s
- Price$1.43
- Modalities3
Step 5
StepFun · Up-and-coming labs building models that rival the leaders.
Card stats
Intelligence ▲ higher wins
Intelligence Index: a composite score from 10 hard evaluations covering reasoning, knowledge, coding, agents and science.
43.7
beats 68% of deck
Hallucination ▼ lower wins
Hallucination rate: of the questions a model gets wrong, how often it confidently makes up an answer instead of saying it doesn't know. Lower wins.
43 %
beats 65% of deck
Context ▲ higher wins
Context window: how many tokens of input the model can consider at once.
1M
beats 65% of deck
Knowledge ▲ higher wins
Training-data cutoff: the most recent month the model learned about. Later wins. N/D means the lab hasn't disclosed it, and an N/D card loses this stat.
N/D
beats 16% of deck
Speed ▲ higher wins
Median output speed in tokens per second, measured on the labs' own APIs.
87 tok/s
beats 36% of deck
Response ▼ lower wins
End-to-end response time: seconds to receive a 500-token answer, thinking time included. Lower wins.
31.6 s
beats 52% of deck
Price ▼ lower wins
Blended price per million tokens (3:1 input to output). Lower wins.
$1.43
beats 52% of deck
Modalities ▲ higher wins
Number of supported input and output modalities: text, image, audio and video.
3
beats 45% of deck
Knowledge: The lab hasn’t published a training-data cutoff, so this card shows N/D and loses the Knowledge stat.
Model facts
- Released
- 2026-09-18
- Weights
- Proprietary
- Parameters
- 600B (27B active)
- Reasoning
- Yes
- Price in / out
- $1 / $2.7 per 1M
- Time to first token
- 2.82 s
- Humanity’s Last Exam
- 46.5%
- GPQA Diamond
- —
- SciCode
- 58.9%