vs
0:0
overall capability wins (2 ties across 2 scored). Grok 4 Fast leads overall.
- Pricing3:0
- Speed2:0
Verdict
Grok 4 Fast is ~4.5x cheaper on a blended token basis than Grok Build 0.1.
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Grok 4 Fast
- $0.33
- Grok Build 0.1
- $1.50
Grok 4 Fast is about 4.6x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
xAI
xAI
Family
Grok
Grok
License
Proprietary
Proprietary
Open weights
No
No
Release
Sep 1, 2025
Jul 1, 2026
Knowledge cutoff
-
-
API / provider
xAI
xAI
Modalities
text, image → text
text → text
Specs
Context window
256K
256K
Max output
64K
64K
Parameters
—
—
Pricing
Input $/1M
$0.20
$1
Output $/1M
$0.50
$2
Blended $/1M (3∶1)
$0.28
$1.25
Speed
tok/s
160
120
TTFT (s)
0.2
0.28
Reasoning
MMLU-Pro
—
—
GPQA Diamond
84.7
—
Humanity's Last Exam
19.1
—
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
22.8
—
AA-LCR v1.1
73.7
—
CritPt
2.9
—
MMMU-Pro
61.8
—
IFBench
50.5
—
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
—
—
SWE-bench Multilingual
—
—
LiveCodeBench
—
—
Terminal-Bench 2.1
—
—
Aider Polyglot
—
—
Terminal-Bench 3
—
—
BigCodeBench
—
—
SciCode
44.2
—
CursorBench
—
—
SWE-Rebench
—
—
NL2Repo-Bench
—
—
DeepSWE
—
—
WebDev Arena
—
—
Terminal-Bench 4.0
—
—
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
—
—
| Metric | Grok 4 Fast | Grok Build 0.1 | Delta |
|---|---|---|---|
| Identity | |||
| Organization | xAI | xAI | — |
| Family | Grok | Grok | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Sep 1, 2025 | Jul 1, 2026 | — |
| Knowledge cutoff | - | - | — |
| API / provider | xAI | xAI | — |
| Modalities | text, image → text | text → text | — |
| Specs | |||
| Context window | 256K | 256K | tie |
| Max output | 64K | 64K | tie |
| Parameters | — | — | — |
| Pricing | |||
| Input $/1M | $0.20 | $1 | A +$0.80 |
| Output $/1M | $0.50 | $2 | A +$1.50 |
| Blended $/1M (3∶1) | $0.28 | $1.25 | A +$0.97 |
| Speed | |||
| tok/s | 160 | 120 | A +40 |
| TTFT (s) | 0.2 | 0.28 | A +0.08 |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 84.7 | — | — |
| Humanity's Last Exam | 19.1 | — | — |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 22.8 | — | — |
| AA-LCR v1.1 | 73.7 | — | — |
| CritPt | 2.9 | — | — |
| MMMU-Pro | 61.8 | — | — |
| IFBench | 50.5 | — | — |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | — | — | — |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | — | — | — |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | — | — | — |
| BigCodeBench | — | — | — |
| SciCode | 44.2 | — | — |
| CursorBench | — | — | — |
| SWE-Rebench | — | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | — | — | — |
| Terminal-Bench 4.0 | — | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | — | — | — |
Grok 4 Fast
- Context
- 256K / 64K out
- Parameters
- —
- Price
- $0.20 / $0.50
- Speed
- 160 tok/s · 0.2s TTFT
- Modalities
- text, image → text
- License
- Proprietary
Latency-optimized Grok 4 variant with aggressive token pricing.
Grok Build 0.1
- Context
- 256K / 64K out
- Parameters
- —
- Price
- $1 / $2
- Speed
- 120 tok/s · 0.28s TTFT
- Modalities
- text → text
- License
- Proprietary
xAI coding/build-oriented SKU at $1/$2 with 256k context (long-context rates above 200k prompts).
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.
These two models have no overlapping published benchmarks in our dataset. Compare specs and pricing instead.