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Model comparison · Updated 10 Oct 2026

Claude Fable 5.1 vs GPT-5 Image

Claude Fable 5.1 and GPT-5 Image cost the same on input, $10.00 per 1M tokens. Claude Fable 5.1 has the larger context window (1M against 400K tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $9,000 a month for Claude Fable 5.1 and $5,400 for GPT-5 Image.

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ModelsAtlas. “Claude Fable 5.1 vs GPT-5 Image”. Retrieved 10 Oct 2026. https://modelsatlas.com/compare/anthropic/claude-fable-5-1/vs/openai/gpt-5-image

Model A

Claude Fable 5.1

by Anthropic · weights not marked open · GRIDG5

Input / 1M
$10.00
observed We measured
Source
Our catalogue
Retrieved
10 Oct 2026
Output / 1M$50.00
Context1M
vs

Model B

GPT-5 Image

by OpenAI · weights not marked open · GRIDG4

Input / 1M
$10.00
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$10.00
Context400K

Key numbers

Standard tier · highlighted = better

Claude Fable 5.1
GPT-5 Image
Input / 1M tokens
$10.00
$10.00
Output / 1M tokens
$50.00
$10.00
Batch input / output
$5.00 / $25.00
Not listed
Context window
1,000,000
400,000
Input types
Not disclosed
Not disclosed
Weights
Not marked open
Not marked open
Tiers listed
batch, standard
standard
Prices checked
2026-10-10
2026-08-17

What it costs for real workloads

Monthly, standard tier, 30 days

Support chatbot10k chats/day · 1.5k in, 300 out
$9,000/mo
$5,400/mo
RAG over documents2k queries/day · 12k in, 500 out
$8,700/mo
$7,500/mo
Coding agent300 tasks/day · 60k in, 8k out
$9,000/mo
$6,120/mo

Claude Fable 5.1   GPT-5 Image · Derived from the standard-tier prices above, input and output tokens per request as stated, 30 days. Excludes caching discounts and batch. Try your own numbers.

On the atlas

Price band (A–H) × context band (1–6)

1 square apart. GPT-5 Image (G4) sits 1 context band smaller than Claude Fable 5.1 (G5).

Same square as Claude Fable 5.1: Claude Fable 5 ($10.00). Open G5 · Open G4

AFreeB<$0.10C$0.10–0.30D$0.30–1E$1–3F$3–10G$10–30H$30+1<32K232–128K3128–256K4256K–1M51M6>1MINPUT PRICE PER 1M TOKENS →CONTEXT WINDOW ↑ · position within a square follows the real valueClaude Fable 5 · G5GPT-6 Astra · G6Claude Opus 4.6 · F5Claude Opus 4.7 · F5Claude Opus 4.8 · F5GPT-5.4 Image 2 · F4Claude Opus 4 · G3Claude Opus 4.1 · G3o1 · G3Claude Fable 5.1Claude Fable 5.1GPT-5 ImageGPT-5 Image
Claude Fable 5.1GPT-5 ImageNearest neighboursOpen weights
View the map as a table (6 squares)
SquarePrice bandContext bandModels
GRIDF4$3–10256K–1MGPT-5.4 Image 2
GRIDF5$3–101MClaude Opus 4.6, Claude Opus 4.7, Claude Opus 4.8
GRIDG3$10–30128–256KClaude Opus 4, Claude Opus 4.1, o1
GRIDG4$10–30256K–1MGPT-5 Image
GRIDG5$10–301MClaude Fable 5.1, Claude Fable 5
GRIDG6$10–30>1MGPT-6 Astra

Capabilities side by side

Only what our records list

Claude Fable 5.1
GPT-5 Image
Vision input
Not disclosed
Not disclosed
Audio input
Not disclosed
Not disclosed
Open weights
Not marked open
Not marked open
Batch tier
Supported
Not listed
Free tier
Not listed
Not listed
Thinking tier
Not listed
Not listed

Neither record lists input types, so we do not claim any.

Which should you choose?

Editorial

Choose Claude Fable 5.1 if…

  • your prompts are long: it takes 1,000,000 tokens against 400,000
  • work can wait: it lists a batch tier and the other does not

Choose GPT-5 Image if…

  • output dominates your bill: $10.00 per 1M output against $50.00

Each reason is a fact from the tables above. Picking between them is our judgement, and we do not benchmark quality: price and context are what we can measure, so test both on your own prompts before you commit.

Questions

Is Claude Fable 5.1 better than GPT-5 Image?
We do not benchmark quality, so we cannot say. On the recorded numbers: Claude Fable 5.1 and GPT-5 Image cost the same on input, $10.00 per 1M tokens. Claude Fable 5.1 has the larger context window (1M against 400K tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $9,000 a month for Claude Fable 5.1 and $5,400 for GPT-5 Image. Which is better for you depends on your task; test both on your own prompts.
Which is cheaper, Claude Fable 5.1 or GPT-5 Image?
They cost the same on input, $10.00 per 1M tokens. Output is $50.00 for Claude Fable 5.1 and $10.00 for GPT-5 Image.
How much does each cost per 1M tokens?
Claude Fable 5.1: $10.00 input and $50.00 output. GPT-5 Image: $10.00 input and $10.00 output. Standard tier, USD.
Which has the larger context window?
Claude Fable 5.1, with 1,000,000 tokens. GPT-5 Image has 400,000 tokens.
Do both offer batch pricing?
Claude Fable 5.1 lists a batch tier, at 50% of its standard price. GPT-5 Image lists no batch tier.
Can both read images or audio?
Input types recorded for Claude Fable 5.1: none recorded. For GPT-5 Image: none recorded. Where a record lists none we say so rather than guess; check each vendor's documentation before relying on a capability.
Is either model open-weight?
Claude Fable 5.1: not marked open-weight in our records. GPT-5 Image: not marked open-weight in our records.
What would each cost for a support chatbot?
At 10,000 chats a day, 1,500 input and 300 output tokens each, 30 days, standard tier: about $9,000 a month for Claude Fable 5.1 and $5,400 for GPT-5 Image. This is our calculation from the listed prices, not a quote.

About the two models

Claude Fable 5.1

By Anthropic. $10.00 input and $50.00 output per 1M tokens, 1M context, atlas square G5. Tiers listed: batch, standard.

Full specs & pricing →

GPT-5 Image

By OpenAI. $10.00 input and $10.00 output per 1M tokens, 400K context, atlas square G4. Tiers listed: standard.

Full specs & pricing →

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