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A · closed · GPT-5.x

GPT-5.4 Mini

OpenAI

B · closed · GPT-5.x

GPT-5.5

OpenAI

0:14

overall capability wins (1 ties across 15 scored). GPT-5.5 leads overall.

  • Reasoning0:7
  • Coding0:4
  • Arena0:1
  • Tool use0:1
  • Composite indices0:2
  • Pricing3:0
  • Speed2:0
  • Specs0:1

Verdict

GPT-5.5 leads coding (widest gap: +112.9 on WebDev Elo); GPT-5.5 ranks higher on LMArena (+28 Elo); GPT-5.5 offers ~2.6x larger context (1.1M vs 400K).

  • GPT-5.5 leads coding (widest gap: +112.9 on WebDev Elo)
  • GPT-5.5 ranks higher on LMArena (+28 Elo)
  • GPT-5.5 offers ~2.6x larger context (1.1M vs 400K)
  • GPT-5.4 Mini is ~6.7x cheaper on a blended token basis than GPT-5.5

Cost for 1M in + 250K out

Illustrative chat workload at primary-provider list prices.

GPT-5.4 Mini
$1.88
GPT-5.5
$12.50

GPT-5.4 Mini is about 6.7x 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

Apr 23, 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

$5

A +$4.25

Output $/1M

$4.50

$30

A +$25.50

Blended $/1M (3∶1)

$1.69

$11.25

A +$9.56

Speed

tok/s

130

70

A +60

TTFT (s)

0.25

0.5

A +0.25

Reasoning

MMLU-Pro

—

—

—

GPQA Diamond

87.5

93.5

B +6.0 pts

Humanity's Last Exam

28.1

45.8

B +17.7 pts

AIME 2025

—

—

—

MATH-500

—

—

—

Humanity's Last Exam (with tools)

—

—

—

AA-Omniscience Accuracy

37.5

58.0

B +20.5 pts

AA-LCR v1.1

77.0

84.3

B +7.3 pts

CritPt

10.0

27.1

B +17.1 pts

MMMU-Pro

73.3

79.9

B +6.6 pts

IFBench

73.3

75.9

B +2.6 pts

Chartography

—

—

—

Chartography (With Tools)

—

—

—

Coding

SWE-bench Verified

—

—

—

SWE-bench Pro

54.4

58.6

B +4.2 pts

SWE-bench Multilingual

—

—

—

LiveCodeBench

—

—

—

Terminal-Bench 2.1

59.2

84.3

B +25.1 pts

Aider Polyglot

—

—

—

Terminal-Bench 3

—

—

—

BigCodeBench

—

—

—

SciCode

52.1

55.8

B +3.7 pts

CursorBench

—

58.4

—

SWE-Rebench

—

62.7

—

NL2Repo-Bench

—

—

—

DeepSWE

—

67.0

—

WebDev Arena

1,397

1,510

B +113 Elo

Terminal-Bench 4.0

—

—

—

CursorBench 4.0

—

—

—

FrontierCode v1.1 (Main)

—

—

—

Arena

LMArena Elo

1,448

1,476

B +28 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-5.5

Context
1.1M / 128K out
Parameters
—
Price
$5 / $30
Speed
70 tok/s · 0.5s TTFT
Modalities
text, image → text
License
Proprietary

Prior OpenAI flagship with strong coding and long context; still widely used alongside the newer 5.6 family.

Benchmark charts

Winner bars are emphasized. Per-benchmark deltas sit above each chart.

Reasoning & knowledge

GPQA: B +6.0HLE: B +17.7CritPt: B +17.1AA-LCR: B +7.3Omniscience Acc.: B +20.5MMMU-Pro: B +6.6IFBench: B +2.6

Coding

SWE-Pro: B +4.2TermBench: B +25.1SciCode: B +3.7WebDev Elo: B +113

Tool use & function calling

τ³-Banking: B +13.4

Arena

Arena Elo: B +28

Composite indices

AA Index: B +14.0AA Index v4.3: B +14.0

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