vs
1:12
overall capability wins (1 ties across 14 scored). GPT-5.6 Terra leads overall.
- Reasoning1:6
- Coding0:3
- Arena0:1
- Tool use0:1
- Pricing3:0
- Speed0:2
- Specs0:1
Verdict
GPT-5.6 Terra leads coding (widest gap: +52.8 on TermBench); GPT-5.6 Terra ranks higher on LMArena (+31 Elo); GPT-5.6 Terra offers ~2.6x larger context (1.1M vs 400K).
- GPT-5.6 Terra leads coding (widest gap: +52.8 on TermBench)
- GPT-5.6 Terra ranks higher on LMArena (+31 Elo)
- GPT-5.6 Terra offers ~2.6x larger context (1.1M vs 400K)
- GPT-5 is ~1.3x cheaper on a blended token basis than GPT-5.6 Terra
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- GPT-5
- $3.75
- GPT-5.6 Terra
- $5
GPT-5 is about 1.3x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
OpenAI
OpenAI
Family
GPT-5.x
GPT-5.x
License
Proprietary
Proprietary
Open weights
No
No
Release
Aug 7, 2025
Jul 9, 2026
Knowledge cutoff
2024-09
-
API / provider
OpenAI
OpenAI
Modalities
text, image → text
text, image → text
Specs
Context window
400K
1.1M
Max output
128K
128K
Parameters
—
—
Pricing
Input $/1M
$1.25
$2
Output $/1M
$10
$12
Blended $/1M (3∶1)
$3.44
$4.50
Speed
tok/s
90
135
TTFT (s)
0.4
0.3
Reasoning
MMLU-Pro
—
—
GPQA Diamond
85.4
92.5
Humanity's Last Exam
28.5
42.9
AIME 2025
94.6
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
40.3
46.8
AA-LCR v1.1
78.2
83.0
CritPt
5.7
30.0
MMMU-Pro
74.2
80.7
IFBench
73.1
71.2
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
74.9
—
SWE-bench Pro
41.8
63.4
SWE-bench Multilingual
—
—
LiveCodeBench
—
—
Terminal-Bench 2.1
35.2
88.0
Aider Polyglot
88.0
—
Terminal-Bench 3
—
20.8
BigCodeBench
—
—
SciCode
42.9
55.0
CursorBench
—
64.9
SWE-Rebench
—
—
NL2Repo-Bench
—
—
DeepSWE
—
—
WebDev Arena
—
1,521
Terminal-Bench 4.0
—
21.5
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
1,435
1,466
| Metric | GPT-5 | GPT-5.6 Terra | Delta |
|---|---|---|---|
| Identity | |||
| Organization | OpenAI | OpenAI | — |
| Family | GPT-5.x | GPT-5.x | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Aug 7, 2025 | Jul 9, 2026 | — |
| Knowledge cutoff | 2024-09 | - | — |
| API / provider | OpenAI | OpenAI | — |
| Modalities | text, image → text | text, image → text | — |
| Specs | |||
| Context window | 400K | 1.1M | B +650K |
| Max output | 128K | 128K | tie |
| Parameters | — | — | — |
| Pricing | |||
| Input $/1M | $1.25 | $2 | A +$0.75 |
| Output $/1M | $10 | $12 | A +$2 |
| Blended $/1M (3∶1) | $3.44 | $4.50 | A +$1.06 |
| Speed | |||
| tok/s | 90 | 135 | B +45 |
| TTFT (s) | 0.4 | 0.3 | B +0.10 |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 85.4 | 92.5 | B +7.1 pts |
| Humanity's Last Exam | 28.5 | 42.9 | B +14.4 pts |
| AIME 2025 | 94.6 | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 40.3 | 46.8 | B +6.5 pts |
| AA-LCR v1.1 | 78.2 | 83.0 | B +4.8 pts |
| CritPt | 5.7 | 30.0 | B +24.3 pts |
| MMMU-Pro | 74.2 | 80.7 | B +6.5 pts |
| IFBench | 73.1 | 71.2 | A +1.9 pts |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | 74.9 | — | — |
| SWE-bench Pro | 41.8 | 63.4 | B +21.6 pts |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | 35.2 | 88.0 | B +52.8 pts |
| Aider Polyglot | 88.0 | — | — |
| Terminal-Bench 3 | — | 20.8 | — |
| BigCodeBench | — | — | — |
| SciCode | 42.9 | 55.0 | B +12.1 pts |
| CursorBench | — | 64.9 | — |
| SWE-Rebench | — | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | — | 1,521 | — |
| Terminal-Bench 4.0 | — | 21.5 | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | 1,435 | 1,466 | B +31 Elo |
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.
GPT-5.6 Terra
- Context
- 1.1M / 128K out
- Parameters
- —
- Price
- $2 / $12
- Speed
- 135 tok/s · 0.3s TTFT
- Modalities
- text, image → text
- License
- Proprietary
Balanced GPT-5.6 mid-tier for everyday work; July 30, 2026 API cut brought Standard rates to $2/$12 (20% lower), with strong throughput for the price.
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.