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Claude Fable 5.1 vs Claude Opus 5

Compare Claude Fable 5.1 from Anthropic and Claude Opus 5 from Anthropic 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 5.1AnthropicClaude Opus 5
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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
Anthropic logo
Claude Opus 5
Anthropic · text, image, pdf → text

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis of charts and documents, complex office deliverables, and coordinating parallel subagents. The model maintains strong instruction following and tool use across extended tasks, while remaining effective at lower effort settings for workloads that prioritize latency and token efficiency.

Input$5 /M
Output$25 /M
Cache read$0.5 /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
Claude Opus 5
Input /M
$11
$5
Output /M
$55
$25
Cache read /M
$0.275
$0.5
Context length
1,000,000
1,000,000
Max output
128,000
128,000
Time to First Token
5.1 s
1.1 s
Throughput
60.2 tok/s
77.1 tok/s
Modalities
textimagepdf
textimagepdf
Supported Parameters
thinkingtoolsfunction callingstructured outputs
thinkingtoolsstructured outputslong contextweb
API Formats
chat_completions · claude_api
chat_completions · claude_api · responses
Released
September 2, 2026
July 24, 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-5-1claude-opus-5

Tokens / day

-

Requests / day

-

Performance Past 3 Days

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

claude-fable-5-1claude-opus-5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

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

Text
claude-fable-5-1claude-opus-5
1440148015201560
Overall
14931504
Coding
15171533
Math
15261526
Hard prompts
15181522
Instruction following
14891498
Multi-turn
14801486
Creative writing
14751487
Longer query
15071515
Chinese
15601560
English
14921509
WebDev Arena
claude-fable-5-1claude-opus-5
1560166017601860
Overall
16611764
React
16771810
HTML
16511678
Gaming
17321893
Simulations
17111872
Data analytics
15801617

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.

Claude Opus 5
$675 /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, Claude Opus 5?

Claude Opus 5: $25/M output tokens; Claude Fable 5.1: $55/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Claude Opus 5: 1533; Claude Fable 5.1: 1517 (LMArena coding leaderboard).

Which responds faster?

Claude Opus 5: 1.1s 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 Claude Opus 5 accepts 1,000,000 input tokens. Maximum output per request is 128,000 tokens on Claude Fable 5.1 and 128,000 tokens on Claude Opus 5.

Which one generates tokens faster?

Claude Opus 5 at 77.1 tok/s and Claude Fable 5.1 at 60.2 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; Claude Opus 5 accepts text, image and PDF input and supports thinking, tool calling, structured outputs, long context and web search.

Can I call Claude Fable 5.1 and Claude Opus 5 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.

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