Claude Fable 5.1 vs Llama 3.1 405B — Together AI

Side-by-side technical and economic comparison between Anthropic's Claude Fable 5.1 and Meta / Together's Llama 3.1 405B — Together AI.

Verdict: Llama 3.1 405B — Together AI is about 83% cheaper than Claude Fable 5.1 at a typical 3:1 input-to-output mix ($3.50 vs $20.00 per 1M blended tokens). Claude Fable 5.1 offers the larger context window (1M tokens).

Endpoint Availability & Transition Notice

• Llama 3.1 405B — Together AI: Classified as a Legacy Reference model (Deprecated on Together AI (Reference)).

Claude Fable 5.1 vs Llama 3.1 405B — Together AI Pricing & Specs

Metric	Claude Fable 5.1	Llama 3.1 405B — Together AI	Advantage
Provider Organization	Anthropic	Meta / Together	—
Standard Input / 1M	$10.00	$3.50	Llama 3.1 405B — Together AI (65% lower)
Cached Input / 1M	$0.25	None	Claude Fable 5.1 lower
Output / 1M	$50.00	$3.50	Llama 3.1 405B — Together AI lower
Context Window	1M	128k	Claude Fable 5.1 (1M)
Max Generation Tokens	32k	4.1k	Claude Fable 5.1
Tokenizer Family	Anthropic Claude BPE (~65k vocabulary)	Meta Llama 3 Tiktoken BPE (~128k vocabulary)	—

Monthly Cost: Claude Fable 5.1 vs Llama 3.1 405B — Together AI

Workload (per month)	Claude Fable 5.1	Llama 3.1 405B — Together AI
Chatbot10k requests · 500 in / 200 out	$150.00	$24.50
RAG app100k requests · 8,000 in / 1,200 out	$14,000.00	$3,220.00
Coding agent100k requests · 12,000 in / 2,000 out	$22,000.00	$4,900.00

Standard rates, no caching or batch discounts. Model your own numbers below.

Interactive Side-by-Side Cost Simulator

Live Delta

Input Tokens / Req2,500

Output Tokens / Req800

Daily Requests10,000

Claude Fable 5.1

$15,843.75 / month

$0.0528 / request

Llama 3.1 405B — Together AILOWER COST

$3,465.00 / month

$0.0116 / request

Selecting Llama 3.1 405B — Together AI saves $12,378.75 / month (78.1% savings) over Claude Fable 5.1.

When to Choose Claude Fable 5.1

Opt for Claude Fable 5.1 when your engineering requirements prioritize Anthropic's ecosystem, specific tokenizer efficiencies (Calibrated Claude Tokenizer (±3%)), or when your expected prompt-to-completion ratios favor its $10/M input rate.

Claude Fable 5.1 Specs & Documentation

When to Choose Llama 3.1 405B — Together AI

Opt for Llama 3.1 405B — Together AI when looking for Meta / Together's tooling integration, specific context window depth (128k tokens), or when output generation volume favors its $3.5/M rate.

Llama 3.1 405B — Together AI Specs & Documentation

Claude Fable 5.1 vs Llama 3.1 405B — Together AI FAQ

Is Claude Fable 5.1 cheaper than Llama 3.1 405B — Together AI?

At a typical 3:1 input-to-output token mix, Llama 3.1 405B — Together AI is about 83% cheaper than Claude Fable 5.1. Claude Fable 5.1 costs $10 per 1M input and $50 per 1M output tokens; Llama 3.1 405B — Together AI costs $3.5 and $3.5.

Which has a larger context window, Claude Fable 5.1 or Llama 3.1 405B — Together AI?

Claude Fable 5.1 has the larger context window: 1M tokens vs 128k.

Do Claude Fable 5.1 and Llama 3.1 405B — Together AI support prompt caching?

Claude Fable 5.1: yes, cached input costs $0.25/1M. Llama 3.1 405B — Together AI: no standard prompt caching discount.