vs
14:1
overall capability wins (3 ties across 18 scored). Claude Opus 5 leads overall.
- Reasoning5:0
- Coding5:1
- Arena1:0
- Agents1:0
- Tool use1:0
- Composite indices2:0
- Pricing0:3
- Speed0:2
- Specs1:0
Verdict
Claude Opus 5 leads coding (widest gap: +131.9 on WebDev Elo); Claude Opus 5 ranks higher on LMArena (+25 Elo); Claude Opus 5 offers ~2.0x larger context (1M vs 500K).
- Claude Opus 5 leads coding (widest gap: +131.9 on WebDev Elo)
- Claude Opus 5 ranks higher on LMArena (+25 Elo)
- Claude Opus 5 offers ~2.0x larger context (1M vs 500K)
- Grok 4.5 is ~3.3x cheaper on a blended token basis than Claude Opus 5
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Claude Opus 5
- $11.25
- Grok 4.5
- $3.50
Grok 4.5 is about 3.2x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
Anthropic
xAI
Family
Claude Opus
Grok
License
Proprietary
Proprietary
Open weights
No
No
Release
Jul 24, 2026
Jul 9, 2026
Knowledge cutoff
-
-
API / provider
Anthropic
xAI
Modalities
text, image → text
text, image → text
Specs
Context window
1M
500K
Max output
128K
128K
Parameters
—
—
Pricing
Input $/1M
$5
$2
Output $/1M
$25
$6
Blended $/1M (3∶1)
$10
$3
Speed
tok/s
72
100
TTFT (s)
0.55
0.35
Reasoning
MMLU-Pro
—
—
GPQA Diamond
93.2
93.1
Humanity's Last Exam
54.9
42.7
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
60.9
51.6
AA-LCR v1.1
79.3
79.3
CritPt
29.1
15.4
MMMU-Pro
84.7
80.4
IFBench
—
—
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
—
—
SWE-bench Multilingual
—
—
LiveCodeBench
—
—
Terminal-Bench 2.1
89.1
81.6
Aider Polyglot
—
—
Terminal-Bench 3
42.7
15.7
BigCodeBench
—
—
SciCode
56.4
55.0
CursorBench
70.0
—
SWE-Rebench
63.4
63.8
NL2Repo-Bench
—
—
DeepSWE
73.7
—
WebDev Arena
1,687
1,555
Terminal-Bench 4.0
51.8
12.4
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
1,493
1,468
| Metric | Claude Opus 5 | Grok 4.5 | Delta |
|---|---|---|---|
| Identity | |||
| Organization | Anthropic | xAI | — |
| Family | Claude Opus | Grok | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Jul 24, 2026 | Jul 9, 2026 | — |
| Knowledge cutoff | - | - | — |
| API / provider | Anthropic | xAI | — |
| Modalities | text, image → text | text, image → text | — |
| Specs | |||
| Context window | 1M | 500K | A +500K |
| Max output | 128K | 128K | tie |
| Parameters | — | — | — |
| Pricing | |||
| Input $/1M | $5 | $2 | B +$3 |
| Output $/1M | $25 | $6 | B +$19 |
| Blended $/1M (3∶1) | $10 | $3 | B +$7 |
| Speed | |||
| tok/s | 72 | 100 | B +28 |
| TTFT (s) | 0.55 | 0.35 | B +0.20 |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 93.2 | 93.1 | A +0.1 pts |
| Humanity's Last Exam | 54.9 | 42.7 | A +12.2 pts |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 60.9 | 51.6 | A +9.3 pts |
| AA-LCR v1.1 | 79.3 | 79.3 | tie |
| CritPt | 29.1 | 15.4 | A +13.7 pts |
| MMMU-Pro | 84.7 | 80.4 | A +4.3 pts |
| IFBench | — | — | — |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | — | — | — |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | 89.1 | 81.6 | A +7.5 pts |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | 42.7 | 15.7 | A +27.0 pts |
| BigCodeBench | — | — | — |
| SciCode | 56.4 | 55.0 | A +1.4 pts |
| CursorBench | 70.0 | — | — |
| SWE-Rebench | 63.4 | 63.8 | B +0.4 pts |
| NL2Repo-Bench | — | — | — |
| DeepSWE | 73.7 | — | — |
| WebDev Arena | 1,687 | 1,555 | A +132 Elo |
| Terminal-Bench 4.0 | 51.8 | 12.4 | A +39.4 pts |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | 1,493 | 1,468 | A +25 Elo |
Claude Opus 5
- Context
- 1M / 128K out
- Parameters
- —
- Price
- $5 / $25
- Speed
- 72 tok/s · 0.55s TTFT
- Modalities
- text, image → text
- License
- Proprietary
Anthropic's July 2026 flagship - top Artificial Analysis Intelligence Index and strong agentic coding at Opus 4.8 pricing.
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.
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.