Pairwise benchmark snapshot · Aug 16, 2026

Claude Fable 5 vs Claude Sonnet 5 benchmark

Name: Claude Fable 5 vs Claude Sonnet 5 AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Claude Fable 5 (Anthropic) and Claude Sonnet 5 (Anthropic) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Fable 5 is ahead by 60 points (1,616 vs 1,556; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Claude Fable 5 resolves 80% versus 73.8% (seed-bootstrap (Aug 16, 2026)). Claude Sonnet 5 streams faster (118 tok/s) while Claude Sonnet 5 is the cheaper output token ($10/1M). Claude Fable 5 has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.

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Anthropic

Claude Fable 5

Anthropic top-tier long-horizon model. Official API $10/$50 per 1M tokens (Claude Platform pricing, Aug 2026).

Elo 1,616$50/1M out

Anthropic

Claude Sonnet 5

Anthropic workhorse. Official $2/$10 per 1M tokens made permanent on Aug 10 2026.

Elo 1,556$10/1M out

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Model A

Model B

Quick vs:vs Claude Opus 4.5 vs Claude Opus 4.6 vs Claude Sonnet 4.5 vs Claude 3.7 Sonnet

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Fable 5 (5)vsClaude Sonnet 5 (4)

Claude Fable 5: 5W (56%)Overall: Claude Fable 5Claude Sonnet 5: 4W (44%)

← Claude Fable 51 tiesClaude Sonnet 5 →

Claude Fable 5 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,616vs1,556

Coding Elo

1,622vs1,562

SWE-bench

80%vs73.8%

LiveBench

75.2%vs70.4%

GPQA Diamond

87.6%vs82.8%

Claude Fable 5: 5WClaude Sonnet 5: 0W

Claude Sonnet 5 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

58 tok/svs118 tok/s

Time to first token

340 msvs175 ms

Claude Fable 5: 0WClaude Sonnet 5: 2W

Claude Sonnet 5 (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$50/1Mvs$10/1M

Input price

$10/1Mvs$2/1M

Context window

1Mvs1M

Claude Fable 5: 0WClaude Sonnet 5: 2W

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect

Percentile 0–100

Dimensional AdvantageClaude Fable 5 3/6

Preference Elo

Claude Fable 5

60 pts advantage

Throughput Speed

Claude Sonnet 5

60 tok/s faster

Price Efficiency

Claude Sonnet 5

$40.00/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+4%1,616

EloHigh is better

1,556

Code Elo

High is better

+4%1,622

Code EloHigh is better

1,562

LiveBench

High is better

+7%75.2%

LiveBenchHigh is better

70.4%

SWE-bench

High is better

+8%80%

SWE-benchHigh is better

73.8%

GPQA

High is better

+6%87.6%

GPQAHigh is better

82.8%

TTFT

Low is better

340 ms

TTFTLow is better

175 ms+94%

Speed

High is better

58 tok/s

SpeedHigh is better

118 tok/s+103%

In $

Low is better

$10/1M

In $Low is better

$2/1M+400%

Out $

Low is better

$50/1M

Out $Low is better

$10/1M+400%

Context

High is better

ContextHigh is better

Interactive Simulator

Workload Cost & Savings Calculator

Simulate monthly production API costs based on published $/1M tokens.

Save up to 80% with Claude Sonnet 5

Monthly Volume50M tokens/mo

Quick Presets:

Token Ratio (In vs Out)70% In / 30% Out

RAG / Search (10% out)Coding / Chat (50% out)

Claude Fable 5$1,100.00 / mo

In: $350.00Out: $750.00

Claude Sonnet 5$220.00 / mo

In: $70.00Out: $150.00

Estimated Cost Delta

Claude Sonnet 5 is estimated to save $880.00/month ($10,560/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Claude Fable 5:Pick Claude Fable 5 when repo-level coding accuracy is the constraint.
2
Claude Sonnet 5:Pick Claude Sonnet 5 when you are optimizing output cost.
3
Claude Sonnet 5:Pick Claude Sonnet 5 when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsClaude Fable 5

Higher SWE-bench (80%).

High-volume chatClaude Sonnet 5

Lower output list price ($10/1M).

Voice / low-latency UIClaude Sonnet 5

Lower TTFT (175 ms).

Long-document RAGClaude Fable 5

Larger window (1M).

Screenshots / visionClaude Fable 5

Both accept images. Defaulting to the higher-Elo side (Claude Fable 5).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Fable 5	Higher SWE-bench (80%).
High-volume chat	Claude Sonnet 5	Lower output list price ($10/1M).
Voice / low-latency UI	Claude Sonnet 5	Lower TTFT (175 ms).
Long-document RAG	Claude Fable 5	Larger window (1M).
Screenshots / vision	Claude Fable 5	Both accept images. Defaulting to the higher-Elo side (Claude Fable 5).

Related Editorial Dispatches & Benchmark Notes

View all news

compareAug 10, 2026

Sonnet vs Opus in 2026: same family, different invoice

Usually Sonnet 5 vs Opus 5. Coding delta versus output $/1M. The workhorse question.

priceAug 10, 2026

Claude Sonnet 5 at $2/$10: the 2026 Anthropic workhorse

Aug 10 2026 made the $2/$10 list permanent. Sonnet is the default Claude unless the repo is actually on fire.

launchJun 15, 2026

Claude Fable 5: the $10/$50 long-horizon Anthropic SKU

Fable 5 is not Sonnet with extra adjectives. It is the expensive long-horizon row. Read SWE-bench and output price together.

launchFeb 18, 2026

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Most of Opus 4.5 coding at a mid-tier price. Sonnet 5 replaced it as the buy; 4.5 remains a compare baseline.

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LIVE

Anthropic

Claude Fable 5

Elo 1,616

LiveBench75.2%

SWE-bench80%

Speed58 tok/s

Output cost$50/1M

Anthropic

Claude Sonnet 5

Elo 1,556

LiveBench70.4%

SWE-bench73.8%

Speed118 tok/s

Output cost$10/1M

Frequently Asked Questions

Which is better overall, Claude Fable 5 or Claude Sonnet 5?: Claude Fable 5 has the higher preference Elo in our latest snapshot (1,616). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Claude Fable 5 or Claude Sonnet 5?: Claude Fable 5 leads SWE-bench at 80% vs 73.8%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Claude Sonnet 5 output tokens are $10/1M versus $50/1M. Input prices and retry rates still move the real bill.
Which is faster, Claude Fable 5 or Claude Sonnet 5?: Claude Sonnet 5 has the lower time-to-first-token (175 ms vs 340 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Claude Fable 5 accepts 1M tokens versus 1M.
Can I self-host either model?: Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?: No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?: Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Claude Fable 5 and Claude Sonnet 5 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Claude Fable 5 matchups →|All Claude Sonnet 5 matchups →

Claude Sonnet 5 vs Claude Sonnet 4.5 (previous sonnet)Claude Opus 5 vs Claude Fable 5 Claude Opus 4.8 vs Claude Fable 5 Claude Opus 4.6 vs Claude Sonnet 5 Claude Opus 4.5 vs Claude Sonnet 5 GPT-5.6 Sol vs Claude Fable 5

Claude Fable 5 vs Claude Sonnet 5 benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Fable 5 (5)vsClaude Sonnet 5 (4)

Claude Fable 5: 5W (56%)Overall: Claude Fable 5Claude Sonnet 5: 4W (44%)

← Claude Fable 51 tiesClaude Sonnet 5 →

Claude Fable 5 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,616vs1,556

Coding Elo

1,622vs1,562

SWE-bench

80%vs73.8%

LiveBench

75.2%vs70.4%

GPQA Diamond

87.6%vs82.8%

Claude Fable 5: 5WClaude Sonnet 5: 0W

Claude Sonnet 5 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

58 tok/svs118 tok/s

Time to first token

340 msvs175 ms

Claude Fable 5: 0WClaude Sonnet 5: 2W

Claude Sonnet 5 (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$50/1Mvs$10/1M

Input price

$10/1Mvs$2/1M

Context window

1Mvs1M

Claude Fable 5: 0WClaude Sonnet 5: 2W

Recommended Workload Routing

Repo / coding agentsClaude Fable 5

Higher SWE-bench (80%).

High-volume chatClaude Sonnet 5

Lower output list price ($10/1M).

Voice / low-latency UIClaude Sonnet 5

Lower TTFT (175 ms).

Long-document RAGClaude Fable 5

Larger window (1M).

Screenshots / visionClaude Fable 5

Both accept images. Defaulting to the higher-Elo side (Claude Fable 5).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Fable 5	Higher SWE-bench (80%).
High-volume chat	Claude Sonnet 5	Lower output list price ($10/1M).
Voice / low-latency UI	Claude Sonnet 5	Lower TTFT (175 ms).
Long-document RAG	Claude Fable 5	Larger window (1M).
Screenshots / vision	Claude Fable 5	Both accept images. Defaulting to the higher-Elo side (Claude Fable 5).

Frequently Asked Questions

Which is better overall, Claude Fable 5 or Claude Sonnet 5?

Claude Fable 5 has the higher preference Elo in our latest snapshot (1,616). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Claude Fable 5 or Claude Sonnet 5?

Claude Fable 5 leads SWE-bench at 80% vs 73.8%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Claude Sonnet 5 output tokens are $10/1M versus $50/1M. Input prices and retry rates still move the real bill.

Which is faster, Claude Fable 5 or Claude Sonnet 5?

Claude Sonnet 5 has the lower time-to-first-token (175 ms vs 340 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Claude Fable 5 accepts 1M tokens versus 1M.

Can I self-host either model?

Neither model is marked open-weights here. You are comparing hosted APIs.

Are these scores from CompareLLM’s own evals?

No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.

What does preference Elo mean on this page?

Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Claude Fable 5 and Claude Sonnet 5 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Fable 5

Claude Sonnet 5

Claude Sonnet 5

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Sonnet vs Opus in 2026: same family, different invoice

Claude Sonnet 5 at $2/$10: the 2026 Anthropic workhorse

Claude Fable 5: the $10/$50 long-horizon Anthropic SKU

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Cast Your Matchup Vote

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CompareLLM Matrix

Claude Fable 5

Claude Sonnet 5

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Fable 5

Claude Sonnet 5

Claude Sonnet 5

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Sonnet vs Opus in 2026: same family, different invoice

Claude Sonnet 5 at $2/$10: the 2026 Anthropic workhorse

Claude Fable 5: the $10/$50 long-horizon Anthropic SKU

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Fable 5

Claude Sonnet 5

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons