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A · closed · GPT-5.x

GPT-5.4 Mini

OpenAI

B · closed · GPT-5.x

GPT-5.6 Sol

OpenAI

1:13

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

  • Reasoning1:6
  • Coding0:4
  • Arena0:1
  • Tool use0:1
  • Composite indices0:2
  • Pricing3:0
  • Speed2:0
  • Specs0:1

Verdict

GPT-5.6 Sol leads coding (widest gap: +220.1 on WebDev Elo); GPT-5.6 Sol ranks higher on LMArena (+35 Elo); GPT-5.6 Sol offers ~2.6x larger context (1.1M vs 400K).

  • GPT-5.6 Sol leads coding (widest gap: +220.1 on WebDev Elo)
  • GPT-5.6 Sol ranks higher on LMArena (+35 Elo)
  • GPT-5.6 Sol offers ~2.6x larger context (1.1M vs 400K)
  • GPT-5.4 Mini is ~4.7x cheaper on a blended token basis than GPT-5.6 Sol

Cost for 1M in + 250K out

Illustrative chat workload at primary-provider list prices.

GPT-5.4 Mini
$1.88
GPT-5.6 Sol
$9

GPT-5.4 Mini is about 4.8x 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

-

2026-02-16

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

$4

A +$3.25

Output $/1M

$4.50

$20

A +$15.50

Blended $/1M (3∶1)

$1.69

$8

A +$6.31

Speed

tok/s

130

96

A +34

TTFT (s)

0.25

0.45

A +0.20

Reasoning

MMLU-Pro

—

—

—

GPQA Diamond

87.5

94.1

B +6.6 pts

Humanity's Last Exam

28.1

49.5

B +21.4 pts

AIME 2025

—

—

—

MATH-500

—

—

—

Humanity's Last Exam (with tools)

—

—

—

AA-Omniscience Accuracy

37.5

59.4

B +21.9 pts

AA-LCR v1.1

77.0

84.0

B +7.0 pts

CritPt

10.0

32.3

B +22.3 pts

MMMU-Pro

73.3

83.4

B +10.1 pts

IFBench

73.3

72.7

A +0.6 pts

Chartography

—

—

—

Chartography (With Tools)

—

—

—

Coding

SWE-bench Verified

—

—

—

SWE-bench Pro

54.4

64.6

B +10.2 pts

SWE-bench Multilingual

—

—

—

LiveCodeBench

—

—

—

Terminal-Bench 2.1

59.2

88.0

B +28.8 pts

Aider Polyglot

—

—

—

Terminal-Bench 3

—

34.6

—

BigCodeBench

—

—

—

SciCode

52.1

57.1

B +5.0 pts

CursorBench

—

67.2

—

SWE-Rebench

—

62.3

—

NL2Repo-Bench

—

—

—

DeepSWE

—

72.7

—

WebDev Arena

1,397

1,617

B +220 Elo

Terminal-Bench 4.0

—

37.3

—

CursorBench 4.0

—

—

—

FrontierCode v1.1 (Main)

—

—

—

Arena

LMArena Elo

1,448

1,484

B +35 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 Sol

Context
1.1M / 128K out
Parameters
—
Price
$4 / $20
Speed
96 tok/s · 0.45s TTFT
Modalities
text, image → text
License
Proprietary

OpenAI's July 2026 flagship reasoning tier, tuned for hard STEM and agentic work; ChatGPT's top API SKU in the 5.6 family. Promotional Standard rates are $4/$20 (through at least Nov 21, 2026). Fast mode (2× price) delivers up to 2.5× Standard speed, and the Cerebras-powered Ultrafast preview reaches up to 750 tok/s.

Benchmark charts

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

Reasoning & knowledge

GPQA: B +6.6HLE: B +21.4CritPt: B +22.3AA-LCR: B +7.0Omniscience Acc.: B +21.9MMMU-Pro: B +10.1IFBench: A +0.6

Coding

SWE-Pro: B +10.2TermBench: B +28.8SciCode: B +5.0WebDev Elo: B +220

Tool use & function calling

τ³-Banking: B +18.7

Arena

Arena Elo: B +35

Composite indices

AA Index: B +26.7AA Index v4.3: B +22.5

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