← Models

Claude Fable 5.1 vs GPT 6 Astra

Compare Claude Fable 5.1 from Anthropic and GPT 6 Astra from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

AnthropicClaude Fable 5.1OpenAIGPT 6 Astra
+ Add model · 2/4
Anthropic logo
Claude Fable 5.1
Anthropic · text, image, pdf → text

Claude-fable-5-1 is Anthropic's most capable newly released model, suitable for the most demanding reasoning and long-running agent work. Claude Fable 5.1, while keeping input and output prices the same as Claude Fable 5, reduces cache read prices to one quarter of the original and is more capable for long-running agent programming, multi-step research, and document, spreadsheet, and slide processing. (The model is extremely expensive and not recommended for casual use.)

Input$11 /M
Output$55 /M
Cache read$0.275 /M
Details
OpenAI logo
GPT 6 Astra
OpenAI · text, image → text

GPT-6 Astra is OpenAI's newest and most intelligent model, with industry-leading performance in computer operations, web browsing, software engineering, scientific research, and professional work. It excels at executing multi-step workflows across code, browsers, and various professional software. Astra can achieve better results with significantly fewer output tokens, making its estimated API cost per task lower.

Input$10 /M
Output$50 /M
Cache read$1 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

Claude Fable 5.1
GPT 6 Astra
Input /M
$11
$10
Output /M
$55
$50
Cache read /M
$0.275
$1
Context length
1,000,000
1,050,000
Max output
128,000
128,000
Time to First Token
5.1 s
12.3 s
Throughput
60.2 tok/s
32.2 tok/s
Modalities
textimagepdf
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputs
toolsthinkingstructured outputs
API Formats
chat_completions · claude_api
chat_completions · responses
Released
September 2, 2026
September 5, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

claude-fable-5-1gpt-6-astra

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

claude-fable-5-1gpt-6-astra

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

WebDev Arena
claude-fable-5-1gpt-6-astra
16001680176018401920
Overall
17641796
React
18101819
HTML
16781725
Gaming
18671893
Simulations
18461872
Data analytics
16171692

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

GPT 6 Astra
$1,350 /mo
Claude Fable 5.1
$1,485 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: Claude Fable 5.1, GPT 6 Astra?

GPT 6 Astra: $50/M output tokens; Claude Fable 5.1: $55/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

Claude Fable 5.1: 5.1s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

Claude Fable 5.1 accepts 1,000,000 and GPT 6 Astra accepts 1,050,000 input tokens. Maximum output per request is 128,000 tokens on Claude Fable 5.1 and 128,000 tokens on GPT 6 Astra.

Which one generates tokens faster?

Claude Fable 5.1 at 60.2 tok/s and GPT 6 Astra at 32.2 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Claude Fable 5.1 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs; GPT 6 Astra accepts text and image input and supports tool calling, thinking and structured outputs.

Can I call Claude Fable 5.1 and GPT 6 Astra with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

Popular comparisons

Related model match-ups readers also look at.

Kimi K3vsQwen3.8 Max PreviewClaude Opus 5vsGPT 5.6 LunaClaude Opus 5vsClaude Sonnet 5Gemini 3.1 Pro PreviewvsGPT 5.5GLM 5.2vsKimi K3Gemini 3.6 FlashvsQwen3.8 MaxDeepSeek V4 FlashvsGLM 5.2Claude Opus 5vsGrok 4.5

© 2023 - 2026 AIHubMix, LLC

Product

Developer

Connect

Terms & Policies