vs
9:0
overall capability wins (0 ties across 9 scored). Grok 4.5 leads overall.
- Reasoning6:0
- Coding1:0
- Pricing0:3
- Speed0:2
- Specs2:0
Verdict
Grok 4.5 leads coding (widest gap: +10.8 on SciCode); Grok 4.5 offers ~2.0x larger context (500K vs 256K); Grok 4.5 allows ~2.0x more max output (128K vs 64K).
- Grok 4.5 leads coding (widest gap: +10.8 on SciCode)
- Grok 4.5 offers ~2.0x larger context (500K vs 256K)
- Grok 4.5 allows ~2.0x more max output (128K vs 64K)
- Grok 4 Fast is ~10.9x cheaper on a blended token basis than Grok 4.5
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Grok 4.5
- $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
Jul 9, 2026
Sep 1, 2025
Knowledge cutoff
-
-
API / provider
xAI
xAI
Modalities
text, image → text
text, image → text
Specs
Context window
500K
256K
Max output
128K
64K
Parameters
—
—
Pricing
Input $/1M
$2
$0.20
Output $/1M
$6
$0.50
Blended $/1M (3∶1)
$3
$0.28
Speed
tok/s
100
160
TTFT (s)
0.35
0.2
Reasoning
MMLU-Pro
—
—
GPQA Diamond
93.1
84.7
Humanity's Last Exam
42.7
19.1
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
51.6
22.8
AA-LCR v1.1
79.3
73.7
CritPt
15.4
2.9
MMMU-Pro
80.4
61.8
IFBench
—
50.5
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
—
—
SWE-bench Multilingual
—
—
LiveCodeBench
—
—
Terminal-Bench 2.1
81.6
—
Aider Polyglot
—
—
Terminal-Bench 3
15.7
—
BigCodeBench
—
—
SciCode
55.0
44.2
CursorBench
—
—
SWE-Rebench
63.8
—
NL2Repo-Bench
—
—
DeepSWE
—
—
WebDev Arena
1,555
—
Terminal-Bench 4.0
12.4
—
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
1,468
—
| Metric | Grok 4.5 | Grok 4 Fast | Delta |
|---|---|---|---|
| Identity | |||
| Organization | xAI | xAI | — |
| Family | Grok | Grok | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Jul 9, 2026 | Sep 1, 2025 | — |
| Knowledge cutoff | - | - | — |
| API / provider | xAI | xAI | — |
| Modalities | text, image → text | text, image → text | — |
| Specs | |||
| Context window | 500K | 256K | A +244K |
| Max output | 128K | 64K | A +64K |
| Parameters | — | — | — |
| 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 | 100 | 160 | B +60 |
| TTFT (s) | 0.35 | 0.2 | B +0.15 |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 93.1 | 84.7 | A +8.4 pts |
| Humanity's Last Exam | 42.7 | 19.1 | A +23.6 pts |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 51.6 | 22.8 | A +28.8 pts |
| AA-LCR v1.1 | 79.3 | 73.7 | A +5.6 pts |
| CritPt | 15.4 | 2.9 | A +12.5 pts |
| MMMU-Pro | 80.4 | 61.8 | A +18.6 pts |
| IFBench | — | 50.5 | — |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | — | — | — |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | 81.6 | — | — |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | 15.7 | — | — |
| BigCodeBench | — | — | — |
| SciCode | 55.0 | 44.2 | A +10.8 pts |
| CursorBench | — | — | — |
| SWE-Rebench | 63.8 | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | 1,555 | — | — |
| Terminal-Bench 4.0 | 12.4 | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | 1,468 | — | — |
Grok 4.5
- Context
- 500K / 128K out
- Parameters
- —
- Price
- $2 / $6
- Speed
- 100 tok/s · 0.35s TTFT
- Modalities
- text, image → text
- License
- Proprietary
xAI/SpaceXAI public API flagship (July 2026) - Cursor-trained coding focus at $2/$6. For the Cursor IDE jointly-trained SKU and Fast tier, see Cursor Grok 4.5.
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.