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A · closed · GPT-5.x

GPT-5.4 Nano

OpenAI

B · closed · GPT-5.x

GPT-5.6 Terra

OpenAI

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
  • Composite indices0:2
  • Pricing3:0
  • Speed2:0
  • Specs0:1

Verdict

GPT-5.6 Terra leads coding (widest gap: +27.3 on TermBench); GPT-5.6 Terra ranks higher on LMArena (+64 Elo); GPT-5.6 Terra offers ~2.6x larger context (1.1M vs 400K).

  • GPT-5.6 Terra leads coding (widest gap: +27.3 on TermBench)
  • GPT-5.6 Terra ranks higher on LMArena (+64 Elo)
  • GPT-5.6 Terra offers ~2.6x larger context (1.1M vs 400K)
  • GPT-5.4 Nano is ~9.7x 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-5.4 Nano
$0.51
GPT-5.6 Terra
$5

GPT-5.4 Nano is about 9.8x 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 17, 2026

Jul 9, 2026

Knowledge cutoff

-

-

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

$0.20

$2

A +$1.80

Output $/1M

$1.25

$12

A +$10.75

Blended $/1M (3∶1)

$0.46

$4.50

A +$4.04

Speed

tok/s

180

135

A +45

TTFT (s)

0.18

0.3

A +0.12

Reasoning

MMLU-Pro

—

—

—

GPQA Diamond

81.7

92.5

B +10.8 pts

Humanity's Last Exam

28.3

42.9

B +14.6 pts

AIME 2025

—

—

—

MATH-500

—

—

—

Humanity's Last Exam (with tools)

—

—

—

AA-Omniscience Accuracy

25.7

46.8

B +21.1 pts

AA-LCR v1.1

76.7

83.0

B +6.3 pts

CritPt

9.3

30.0

B +20.7 pts

MMMU-Pro

65.4

80.7

B +15.3 pts

IFBench

75.9

71.2

A +4.7 pts

Chartography

—

—

—

Chartography (With Tools)

—

—

—

Coding

SWE-bench Verified

—

—

—

SWE-bench Pro

52.4

63.4

B +11.0 pts

SWE-bench Multilingual

—

—

—

LiveCodeBench

—

—

—

Terminal-Bench 2.1

60.7

88.0

B +27.3 pts

Aider Polyglot

—

—

—

Terminal-Bench 3

—

20.8

—

BigCodeBench

—

—

—

SciCode

47.2

55.0

B +7.8 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

1,402

1,466

B +64 Elo

GPT-5.4 Nano

Context
400K / 128K out
Parameters
—
Price
$0.20 / $1.25
Speed
180 tok/s · 0.18s TTFT
Modalities
text, image → text
License
Proprietary

Cheapest GPT-5.4 tier for high-volume classification and light assistants.

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.

Reasoning & knowledge

GPQA: B +10.8HLE: B +14.6CritPt: B +20.7AA-LCR: B +6.3Omniscience Acc.: B +21.1MMMU-Pro: B +15.3IFBench: A +4.7

Coding

SWE-Pro: B +11.0TermBench: B +27.3SciCode: B +7.8

Tool use & function calling

τ³-Banking: B +12.8

Arena

Arena Elo: B +64

Composite indices

AA Index: B +25.6AA Index v4.3: B +21.1

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