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A · closed · GPT-5.x

GPT-5.4 Mini

OpenAI

B · closed · GPT-5.x

GPT-5.6 Terra

OpenAI

1:13

overall capability wins (1 ties across 15 scored). GPT-5.6 Terra leads overall.

  • Reasoning1:6
  • Coding0:4
  • Arena0:1
  • Tool use0:1
  • Composite indices0:2
  • Pricing3:0
  • Speed1:1
  • Specs0:1

Verdict

GPT-5.6 Terra leads coding (widest gap: +124.0 on WebDev Elo); GPT-5.6 Terra ranks higher on LMArena (+18 Elo); GPT-5.6 Terra offers ~2.6x larger context (1.1M vs 400K).

  • GPT-5.6 Terra leads coding (widest gap: +124.0 on WebDev Elo)
  • GPT-5.6 Terra ranks higher on LMArena (+18 Elo)
  • GPT-5.6 Terra offers ~2.6x larger context (1.1M vs 400K)
  • GPT-5.4 Mini is ~2.7x 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 Mini
$1.88
GPT-5.6 Terra
$5

GPT-5.4 Mini is about 2.7x 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

$0.75

$2

A +$1.25

Output $/1M

$4.50

$12

A +$7.50

Blended $/1M (3∶1)

$1.69

$4.50

A +$2.81

Speed

tok/s

130

135

B +5.00

TTFT (s)

0.25

0.3

A +0.05

Reasoning

MMLU-Pro

—

—

—

GPQA Diamond

87.5

92.5

B +5.0 pts

Humanity's Last Exam

28.1

42.9

B +14.8 pts

AIME 2025

—

—

—

MATH-500

—

—

—

Humanity's Last Exam (with tools)

—

—

—

AA-Omniscience Accuracy

37.5

46.8

B +9.3 pts

AA-LCR v1.1

77.0

83.0

B +6.0 pts

CritPt

10.0

30.0

B +20.0 pts

MMMU-Pro

73.3

80.7

B +7.4 pts

IFBench

73.3

71.2

A +2.1 pts

Chartography

—

—

—

Chartography (With Tools)

—

—

—

Coding

SWE-bench Verified

—

—

—

SWE-bench Pro

54.4

63.4

B +9.0 pts

SWE-bench Multilingual

—

—

—

LiveCodeBench

—

—

—

Terminal-Bench 2.1

59.2

88.0

B +28.8 pts

Aider Polyglot

—

—

—

Terminal-Bench 3

—

20.8

—

BigCodeBench

—

—

—

SciCode

52.1

55.0

B +2.9 pts

CursorBench

—

64.9

—

SWE-Rebench

—

—

—

NL2Repo-Bench

—

—

—

DeepSWE

—

—

—

WebDev Arena

1,397

1,521

B +124 Elo

Terminal-Bench 4.0

—

21.5

—

CursorBench 4.0

—

—

—

FrontierCode v1.1 (Main)

—

—

—

Arena

LMArena Elo

1,448

1,466

B +18 Elo

GPT-5.4 Mini

Context
400K / 128K out
Parameters
—
Price
$0.75 / $4.50
Speed
130 tok/s · 0.25s TTFT
Modalities
text, image → text
License
Proprietary

Efficient GPT-5.4 small model approaching full 5.4 quality on coding and computer-use tasks.

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 +5.0HLE: B +14.8CritPt: B +20.0AA-LCR: B +6.0Omniscience Acc.: B +9.3MMMU-Pro: B +7.4IFBench: A +2.1

Coding

SWE-Pro: B +9.0TermBench: B +28.8SciCode: B +2.9WebDev Elo: B +124

Tool use & function calling

τ³-Banking: B +14.6

Arena

Arena Elo: B +18

Composite indices

AA Index: B +22.2AA Index v4.3: B +17.7

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