vs
6:6
overall capability wins (0 ties across 12 scored). Claude Opus 4.5 leads overall.
- Reasoning3:4
- Coding2:0
- Arena1:0
- Pricing0:3
- Speed0:2
- Specs0:2
Verdict
Claude Opus 4.5 leads coding (widest gap: +6.6 on SciCode); GPT-5 edges reasoning & knowledge; Claude Opus 4.5 ranks higher on LMArena (+35 Elo).
- Claude Opus 4.5 leads coding (widest gap: +6.6 on SciCode)
- GPT-5 edges reasoning & knowledge
- Claude Opus 4.5 ranks higher on LMArena (+35 Elo)
- GPT-5 offers ~2.0x larger context (400K vs 200K)
- GPT-5 allows ~2.0x more max output (128K vs 64K)
- GPT-5 is ~2.9x cheaper on a blended token basis than Claude Opus 4.5
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Claude Opus 4.5
- $11.25
- GPT-5
- $3.75
GPT-5 is about 3.0x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
Anthropic
OpenAI
Family
Claude Opus
GPT-5.x
License
Proprietary
Proprietary
Open weights
No
No
Release
Nov 24, 2025
Aug 7, 2025
Knowledge cutoff
-
2024-09
API / provider
Anthropic
OpenAI
Modalities
text, image → text
text, image → text
Specs
Context window
200K
400K
Max output
64K
128K
Parameters
—
—
Pricing
Input $/1M
$5
$1.25
Output $/1M
$25
$10
Blended $/1M (3∶1)
$10
$3.44
Speed
tok/s
65
90
TTFT (s)
0.6
0.4
Reasoning
MMLU-Pro
—
—
GPQA Diamond
86.6
85.4
Humanity's Last Exam
30.1
28.5
AIME 2025
—
94.6
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
46.6
40.3
AA-LCR v1.1
77.3
78.2
CritPt
4.6
5.7
MMMU-Pro
74.0
74.2
IFBench
58.0
73.1
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
74.9
SWE-bench Pro
45.9
41.8
SWE-bench Multilingual
70.7
—
LiveCodeBench
—
—
Terminal-Bench 2.1
—
35.2
Aider Polyglot
—
88.0
Terminal-Bench 3
—
—
BigCodeBench
—
—
SciCode
49.5
42.9
CursorBench
—
—
SWE-Rebench
53.1
—
NL2Repo-Bench
—
—
DeepSWE
—
—
WebDev Arena
1,468
—
Terminal-Bench 4.0
—
—
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
1,470
1,435
| Metric | Claude Opus 4.5 | GPT-5 | Delta |
|---|---|---|---|
| Identity | |||
| Organization | Anthropic | OpenAI | — |
| Family | Claude Opus | GPT-5.x | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Nov 24, 2025 | Aug 7, 2025 | — |
| Knowledge cutoff | - | 2024-09 | — |
| API / provider | Anthropic | OpenAI | — |
| Modalities | text, image → text | text, image → text | — |
| Specs | |||
| Context window | 200K | 400K | B +200K |
| Max output | 64K | 128K | B +64K |
| Parameters | — | — | — |
| Pricing | |||
| Input $/1M | $5 | $1.25 | B +$3.75 |
| Output $/1M | $25 | $10 | B +$15 |
| Blended $/1M (3∶1) | $10 | $3.44 | B +$6.56 |
| Speed | |||
| tok/s | 65 | 90 | B +25 |
| TTFT (s) | 0.6 | 0.4 | B +0.20 |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 86.6 | 85.4 | A +1.2 pts |
| Humanity's Last Exam | 30.1 | 28.5 | A +1.6 pts |
| AIME 2025 | — | 94.6 | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 46.6 | 40.3 | A +6.3 pts |
| AA-LCR v1.1 | 77.3 | 78.2 | B +0.9 pts |
| CritPt | 4.6 | 5.7 | B +1.1 pts |
| MMMU-Pro | 74.0 | 74.2 | B +0.2 pts |
| IFBench | 58.0 | 73.1 | B +15.1 pts |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | 74.9 | — |
| SWE-bench Pro | 45.9 | 41.8 | A +4.1 pts |
| SWE-bench Multilingual | 70.7 | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | — | 35.2 | — |
| Aider Polyglot | — | 88.0 | — |
| Terminal-Bench 3 | — | — | — |
| BigCodeBench | — | — | — |
| SciCode | 49.5 | 42.9 | A +6.6 pts |
| CursorBench | — | — | — |
| SWE-Rebench | 53.1 | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | 1,468 | — | — |
| Terminal-Bench 4.0 | — | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | 1,470 | 1,435 | A +35 Elo |
Claude Opus 4.5
- Context
- 200K / 64K out
- Parameters
- —
- Price
- $5 / $25
- Speed
- 65 tok/s · 0.6s TTFT
- Modalities
- text, image → text
- License
- Proprietary
Late-2025 Opus release that set a high bar on SWE-bench; superseded by 4.8 and Opus 5 for new projects.
GPT-5
- Context
- 400K / 128K out
- Parameters
- —
- Price
- $1.25 / $10
- Speed
- 90 tok/s · 0.4s TTFT
- Modalities
- text, image → text
- License
- Proprietary
Original GPT-5 GA release - still a strong price/performance option versus newer premium SKUs.
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.