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A · closed · Claude Fable / Mythos

Claude Fable 5

Anthropic

B · closed · Claude Opus

Claude Opus 5

Anthropic

9:12

overall capability wins (2 ties across 23 scored). Claude Opus 5 leads overall.

  • Reasoning3:2
  • Coding3:5
  • Arena1:0
  • Agents1:4
  • Tool use0:1
  • Math1:0
  • Composite indices0:2
  • Pricing0:3
  • Speed0:2

Verdict

Claude Opus 5 leads coding (widest gap: +59.0 on WebDev Elo); Claude Fable 5 edges reasoning & knowledge; Claude Fable 5 ranks higher on LMArena (+13 Elo).

  • Claude Opus 5 leads coding (widest gap: +59.0 on WebDev Elo)
  • Claude Fable 5 edges reasoning & knowledge
  • Claude Fable 5 ranks higher on LMArena (+13 Elo)
  • Claude Opus 5 is ~2.0x cheaper on a blended token basis than Claude Fable 5

Cost for 1M in + 250K out

Illustrative chat workload at primary-provider list prices.

Claude Fable 5
$22.50
Claude Opus 5
$11.25

Claude Opus 5 is about 2.0x cheaper on this workload.

Price per 1M tokens

Full comparison

Organization

Anthropic

Anthropic

Family

Claude Fable / Mythos

Claude Opus

License

Proprietary

Proprietary

Open weights

No

No

Release

Jun 9, 2026

Jul 24, 2026

Knowledge cutoff

-

-

API / provider

Anthropic

Anthropic

Modalities

text, image → text

text, image → text

Specs

Context window

1M

1M

tie

Max output

128K

128K

tie

Parameters

—

—

—

Pricing

Input $/1M

$10

$5

B +$5

Output $/1M

$50

$25

B +$25

Blended $/1M (3∶1)

$20

$10

B +$10

Speed

tok/s

58

72

B +14

TTFT (s)

0.7

0.55

B +0.15

Reasoning

MMLU-Pro

—

—

—

GPQA Diamond

92.6

93.2

B +0.6 pts

Humanity's Last Exam

55.5

54.9

A +0.6 pts

AIME 2025

—

—

—

MATH-500

—

—

—

Humanity's Last Exam (with tools)

—

—

—

AA-Omniscience Accuracy

65.4

60.9

A +4.5 pts

AA-LCR v1.1

82.3

79.3

A +3.0 pts

CritPt

28.6

29.1

B +0.5 pts

MMMU-Pro

—

84.7

—

IFBench

63.5

—

—

Chartography

—

—

—

Chartography (With Tools)

—

—

—

Coding

SWE-bench Verified

—

—

—

SWE-bench Pro

80.0

—

—

SWE-bench Multilingual

—

—

—

LiveCodeBench

—

—

—

Terminal-Bench 2.1

84.6

89.1

B +4.5 pts

Aider Polyglot

—

—

—

Terminal-Bench 3

34.1

42.7

B +8.6 pts

BigCodeBench

—

—

—

SciCode

61.0

56.4

A +4.6 pts

CursorBench

70.5

70.0

A +0.5 pts

SWE-Rebench

64.5

63.4

A +1.1 pts

NL2Repo-Bench

—

—

—

DeepSWE

69.9

73.7

B +3.8 pts

WebDev Arena

1,628

1,687

B +59 Elo

Terminal-Bench 4.0

44.6

51.8

B +7.2 pts

CursorBench 4.0

—

—

—

FrontierCode v1.1 (Main)

—

—

—

Arena

LMArena Elo

1,506

1,493

A +13 Elo

Claude Fable 5

Context
1M / 128K out
Parameters
—
Price
$10 / $50
Speed
58 tok/s · 0.7s TTFT
Modalities
text, image → text
License
Proprietary

Mythos-class Anthropic model optimized for long-horizon coding and writing; premium pricing relative to Opus 5.

Claude Opus 5

Context
1M / 128K out
Parameters
—
Price
$5 / $25
Speed
72 tok/s · 0.55s TTFT
Modalities
text, image → text
License
Proprietary

Anthropic's July 2026 flagship - top Artificial Analysis Intelligence Index and strong agentic coding at Opus 4.8 pricing.

Benchmark charts

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

Reasoning & knowledge

GPQA: B +0.6HLE: A +0.6CritPt: B +0.5AA-LCR: A +3.0Omniscience Acc.: A +4.5

Math

FrontierMath T4: A +14.6

Coding

TermBench: B +4.5TermBench 3: B +8.6TermBench 4: B +7.2SciCode: A +4.6CursorBench: A +0.5SWE-Rebench: A +1.1DeepSWE: B +3.8WebDev Elo: B +59

Tool use & function calling

τ³-Banking: B +4.0

Agents & computer use

ALE: B +6.8AutoBench: B +9.5TB-Science: B +8.6OSWorld Partial: A +2.7OSWorld Strict: B +3.5

Arena

Arena Elo: A +13

Composite indices

AA Index: B +0.9AA Index v4.3: B +1.0

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