vs
4:9
overall capability wins (2 ties across 15 scored). GPT-5.6 Terra leads overall.
- Reasoning3:4
- Coding1:3
- Arena0:1
- Tool use0:1
- Pricing0:3
- Speed0:2
Verdict
GPT-5.6 Terra leads coding (widest gap: +134.5 on WebDev Elo); GPT-5.6 Terra is ~1.3x cheaper on a blended token basis than GPT-5.4.
- GPT-5.6 Terra leads coding (widest gap: +134.5 on WebDev Elo)
- GPT-5.6 Terra is ~1.3x cheaper on a blended token basis than GPT-5.4
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- GPT-5.4
- $6.25
- GPT-5.6 Terra
- $5
GPT-5.6 Terra 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
Mar 5, 2026
Jul 9, 2026
Knowledge cutoff
-
-
API / provider
OpenAI
OpenAI
Modalities
text, image → text
text, image → text
Specs
Context window
1.1M
1.1M
Max output
128K
128K
Parameters
—
—
Pricing
Input $/1M
$2.50
$2
Output $/1M
$15
$12
Blended $/1M (3∶1)
$5.63
$4.50
Speed
tok/s
85
135
TTFT (s)
0.4
0.3
Reasoning
MMLU-Pro
—
—
GPQA Diamond
92.0
92.5
Humanity's Last Exam
43.7
42.9
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
50.8
46.8
AA-LCR v1.1
82.0
83.0
CritPt
23.4
30.0
MMMU-Pro
78.4
80.7
IFBench
73.9
71.2
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
57.7
63.4
SWE-bench Multilingual
—
—
LiveCodeBench
—
—
Terminal-Bench 2.1
78.3
88.0
Aider Polyglot
—
—
Terminal-Bench 3
—
20.8
BigCodeBench
—
—
SciCode
56.6
55.0
CursorBench
—
64.9
SWE-Rebench
57.6
—
NL2Repo-Bench
—
—
DeepSWE
—
—
WebDev Arena
1,387
1,521
Terminal-Bench 4.0
—
21.5
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
1,466
1,466
| Metric | GPT-5.4 | GPT-5.6 Terra | Delta |
|---|---|---|---|
| Identity | |||
| Organization | OpenAI | OpenAI | — |
| Family | GPT-5.x | GPT-5.x | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Mar 5, 2026 | Jul 9, 2026 | — |
| Knowledge cutoff | - | - | — |
| API / provider | OpenAI | OpenAI | — |
| Modalities | text, image → text | text, image → text | — |
| Specs | |||
| Context window | 1.1M | 1.1M | tie |
| Max output | 128K | 128K | tie |
| Parameters | — | — | — |
| Pricing | |||
| Input $/1M | $2.50 | $2 | B +$0.50 |
| Output $/1M | $15 | $12 | B +$3 |
| Blended $/1M (3∶1) | $5.63 | $4.50 | B +$1.13 |
| Speed | |||
| tok/s | 85 | 135 | B +50 |
| TTFT (s) | 0.4 | 0.3 | B +0.10 |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 92.0 | 92.5 | B +0.5 pts |
| Humanity's Last Exam | 43.7 | 42.9 | A +0.8 pts |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 50.8 | 46.8 | A +4.0 pts |
| AA-LCR v1.1 | 82.0 | 83.0 | B +1.0 pts |
| CritPt | 23.4 | 30.0 | B +6.6 pts |
| MMMU-Pro | 78.4 | 80.7 | B +2.3 pts |
| IFBench | 73.9 | 71.2 | A +2.7 pts |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | 57.7 | 63.4 | B +5.7 pts |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | 78.3 | 88.0 | B +9.7 pts |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | — | 20.8 | — |
| BigCodeBench | — | — | — |
| SciCode | 56.6 | 55.0 | A +1.6 pts |
| CursorBench | — | 64.9 | — |
| SWE-Rebench | 57.6 | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | 1,387 | 1,521 | B +135 Elo |
| Terminal-Bench 4.0 | — | 21.5 | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | 1,466 | 1,466 | B +0 Elo |
GPT-5.4
- Context
- 1.1M / 128K out
- Parameters
- —
- Price
- $2.50 / $15
- Speed
- 85 tok/s · 0.4s TTFT
- Modalities
- text, image → text
- License
- Proprietary
Solid mid-2026 OpenAI workhorse between GPT-5 and the 5.5/5.6 flagships.
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.