vs
7:0
overall capability wins (0 ties across 7 scored). Grok 4.6 leads overall.
- Reasoning5:0
- Coding1:0
- Pricing0:3
- Specs1:0
Verdict
Grok 4.6 leads coding (widest gap: +12.3 on SciCode); Grok 4.6 offers ~2.0x larger context (500K vs 256K); Grok 4 Fast is ~10.9x cheaper on a blended token basis than Grok 4.6.
- Grok 4.6 leads coding (widest gap: +12.3 on SciCode)
- Grok 4.6 offers ~2.0x larger context (500K vs 256K)
- Grok 4 Fast is ~10.9x cheaper on a blended token basis than Grok 4.6
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Grok 4.6
- $3.50
- Grok 4 Fast
- $0.33
Grok 4 Fast is about 10.8x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
xAI
xAI
Family
Grok
Grok
License
Proprietary
Proprietary
Open weights
No
No
Release
Aug 12, 2026
Sep 1, 2025
Knowledge cutoff
2026-02-01
-
API / provider
xAI
xAI
Modalities
text, image → text
text, image → text
Specs
Context window
500K
256K
Max output
-
64K
Parameters
1.5T
—
Pricing
Input $/1M
$2
$0.20
Output $/1M
$6
$0.50
Blended $/1M (3∶1)
$3
$0.28
Speed
tok/s
-
160
TTFT (s)
-
0.2
Reasoning
MMLU-Pro
—
—
GPQA Diamond
94.9
84.7
Humanity's Last Exam
42.9
19.1
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
48.2
22.8
AA-LCR v1.1
80.3
73.7
CritPt
17.1
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
88.4
—
Aider Polyglot
—
—
Terminal-Bench 3
26.5
—
BigCodeBench
—
—
SciCode
56.5
44.2
CursorBench
70.8
—
SWE-Rebench
—
—
NL2Repo-Bench
—
—
DeepSWE
67.0
—
WebDev Arena
1,618
—
Terminal-Bench 4.0
20.3
—
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
1,456
—
| Metric | Grok 4.6 | Grok 4 Fast | Delta |
|---|---|---|---|
| Identity | |||
| Organization | xAI | xAI | — |
| Family | Grok | Grok | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Aug 12, 2026 | Sep 1, 2025 | — |
| Knowledge cutoff | 2026-02-01 | - | — |
| API / provider | xAI | xAI | — |
| Modalities | text, image → text | text, image → text | — |
| Specs | |||
| Context window | 500K | 256K | A +244K |
| Max output | - | 64K | — |
| Parameters | 1.5T | — | — |
| Pricing | |||
| Input $/1M | $2 | $0.20 | B +$1.80 |
| Output $/1M | $6 | $0.50 | B +$5.50 |
| Blended $/1M (3∶1) | $3 | $0.28 | B +$2.73 |
| Speed | |||
| tok/s | - | 160 | — |
| TTFT (s) | - | 0.2 | — |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 94.9 | 84.7 | A +10.2 pts |
| Humanity's Last Exam | 42.9 | 19.1 | A +23.8 pts |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 48.2 | 22.8 | A +25.4 pts |
| AA-LCR v1.1 | 80.3 | 73.7 | A +6.6 pts |
| CritPt | 17.1 | 2.9 | A +14.2 pts |
| 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 | 88.4 | — | — |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | 26.5 | — | — |
| BigCodeBench | — | — | — |
| SciCode | 56.5 | 44.2 | A +12.3 pts |
| CursorBench | 70.8 | — | — |
| SWE-Rebench | — | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | 67.0 | — | — |
| WebDev Arena | 1,618 | — | — |
| Terminal-Bench 4.0 | 20.3 | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | 1,456 | — | — |
Grok 4.6
- Context
- 500K
- Parameters
- 1.5T
- Price
- $2 / $6
- Speed
- —
- Modalities
- text, image → text
- License
- Proprietary
xAI/SpaceXAI's August 2026 flagship (1.5T-parameter) tuned for long-running agents and ambitious interactive/visual work — 500k context at $2/$6, matches GPT-5.6 Sol on the Artificial Analysis Intelligence Index (61). A fast variant is available at 2x price.
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.
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.