SPEED · COST · QUALITY
Measured matrix / AA / gateway rows only.
- Overall (Matrix)
- 43.4
- AA / Intel index
- 17.9
- Matrix Coding
- 20.4
- Input $/1M
- $0.20
- Output $/1M
- $0.50
- Value pts/$
- 25.57
xAI · ProprietaryGrok 4 Fast (Reasoning)
Active
Model portfolio
Grok 4 Fast (Reasoning)
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xAI · Released 2025-09-19 · v2025-09-19 · Closed · Context 2M tokens
Language Cap
No data yet
language · unranked
Benchmark average
69.8
Not enough benchmark results yet
Pricing
$0.20
$0.50 / 1M out · 25.6 pts/$
CADLE CAP vs MODEL MATRIX
Cadle Cap ranks models on every published score we have for them — harder benchmarks weigh more. Missing tests are skipped, not zeroed. It answers who is stronger than whom in today's pool.
Model Matrix is the datasheet: Overall, Intelligence, Coding, Agentic, MMLU, GPQA, Math, LiveCodeBench, HumanEval, Reason, ARC-AGI. A dash means unmeasured. AVG is an importance-weighted mean of that model's filled cells only.
MODEL MATRIX · TRUTH CENTER CELLS
Overall
43.4
Intelligence
17.9
Coding
20.4
Agentic
65.8
MMLU
76.7
GPQA
84.7
Math
89.7
LiveCodeBench
83.2
HumanEval
No data yet
Reason
63.1
ARC-AGI
No data yet
Coverage AVG
69.8
Cadle Cap ranks models with within-benchmark percentiles so ARC-AGI ~40 and MMLU ~90 never compete raw. Coverage AVG is an importance-weighted mean of filled expert cells only — blanks are skipped, not zeroed.
ANALYSIS · TRUTH CENTER
Hard benches (GPQA · ARC-AGI · LCB · Agentic) sit left — a mid-40 on ARC-AGI can still be frontier. Broader benches on the right are easier and often higher.
NOT RANKED YET
We only rank a model once it has enough published benchmark results to compare fairly. Everything below is what we do know: pricing, news and any scores that have been published.
DESCRIPTION + DETAILS
PROVIDER
xAI
RELEASE
2025-09-19
CONTEXT
2M tokens
STATUS
ACTIVE
COMMUNITY REVIEWS
OPERATOR NOTES
Quality, latency, cost, and failure modes — not marketing copy.
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First review sets the tone for how teams evaluate Grok 4 Fast (Reasoning).
MODEL COMPARISON
| Metric | |
|---|---|
| Provider | xAI |
| Release | 2025-09-19 |
| Input / 1M | $0.20 |
| Output / 1M | $0.50 |
| Context | 2M tokens |
| Cadle Cap | 76 |
| Cap board | Unranked |
DATA PROVENANCE
Scores may use different scales — check the Benchmarks tab for source links.
- Supabase models
- Cadle public observations
SOURCE TRACKING
Evidence linked to this model — listing, hub, benchmarks, or live gateway prices.
API
xAI listing
MEASURED CELLS
Same Truth Center numbers as the datasheet above. Accuracy, reliability, safety, and cost scores are not invented.
Overall43.4
AA IQ17.9
Coding20.4
Agentic65.8
MMLU76.7
GPQA84.7
Math89.7
LiveCodeBench83.2