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AI Choice Engine

Model comparison

Claude Fable 5 vs Grok 4.7

Anthropic against SpaceXAI, compared on context, price, and verified benchmark results.

Catalog record checked September 26, 2026Individual provider fields may changeEvidence confidence: High — see receipts below

Anthropic

Claude Fable 5

Frontier

vs

SpaceXAI

Grok 4.7

Frontier

AI model capability comparison
SpecificationClaude Fable 5Grok 4.7
ProviderAnthropicSpaceXAI
TierFrontierFrontier
Context windowWinner: 1M500K
Max output128KNot verifiedUnverified
Input / 1M tokens$10Winner: $2
Output / 1M tokens$50Winner: $6
WeightsClosedClosed
ParametersNot disclosedUnverifiednew, larger base model with longer RL on multi-hour tasks
Reasoning levelsadaptivelow, medium, high, xhigh
Modalitiestext, imagetext, image
API model idclaude-fable-5grok-4.7
ReleasedJune 9, 2026September 21, 2026
Artificial Analysis Intelligence Index [max] (2026-09-26)49.6Not verifiedUnverified
Artificial Analysis Intelligence Index [xhigh] (2026-09-26)Not verifiedUnverified46.4
DeepSWE 1.1 [high] (2026-09-21)Not verifiedUnverified71
Terminal-Bench 4.0 [xhigh] (2026-09-26)Not verifiedUnverified25.8

Prices are USD per million tokens at standard rates, excluding batch and caching discounts. Bold indicates the better figure where one is objectively better. Values we could not confirm from the provider are shown as “Not verified” rather than estimated.

Benchmark receipts

Where each score comes from, and how far it can be compared across models.

  • 2026-09-26
    Artificial Analysis Terminal-Bench 4.0 (independent AA run, part of Intelligence Index v4.3.2)

    Agentic terminal work: long multi-step tasks executed in a sandboxed shell environment.

    Comparable with caveatNOT comparable with Terminal-Bench 2.x or 3.0 — 4.0 uses a new, non-overlapping task set. Within 4.0, scores from different harnesses (tbench.ai agent entries vs Artificial Analysis runs) are not interchangeable.

  • 2026-09-26
    Artificial Analysis

    Composite index blending reasoning, knowledge, and coding evals into one 0–100 score.

    Comparable with caveatOnly same-version scores are comparable. v4.3.2 was rebaselined (the top score fell from 66 on v4.1.1 to ~58), so v4.1.1 figures must not be compared with v4.3.2 figures — check measuredAt.

  • 2026-09-21
    xAI — Grok 4.7 announcement (vendor; not yet on Datacurve's board)

    Agentic software engineering: pass@1 on real repo tasks with reported cost per completed task.

    Directly comparable

Pricing tiers

Claude Fable 5: Standard $10/$50 per MTok; cache reads 10% of base input. Sibling Claude Mythos 5 is invite-only cyber-defense. Access briefly suspended 2026-06-12, redeployed 2026-07-01.

Grok 4.7: $2/$6 per MTok (<200K prompt); $4/$12 for all tokens at ≥200K. Cached input $0.50/MTok ($1.00 at ≥200K). US regional endpoint 1.1x. No Batch API; the 2x-price 'Fast' variant is Cursor and Grok Build only. xAI lists no separate text-output cap. Knowledge cutoff May 2026.

FrontierRecord checked September 26, 2026

Claude Fable 5

Claude Fable 5 is Anthropic's June 2026 long-running-agent model, now 'Active (legacy)' behind Fable 5.1 at the same $10/$50 price.

Best for

  • Long-running agents
  • Frontier reasoning
  • Enterprise work

Watch out

Superseded: Fable 5.1 costs the same with $0.25 cache reads (vs $1 here), so it is strictly cheaper — migrate unless you have pinned evals.

FrontierRecord checked September 26, 2026

Grok 4.7

Grok 4.7 is xAI's flagship since 2026-09-21 — a larger new base model with longer RL on multi-hour tasks, at Grok 4.6's $2/$6 price.

Best for

  • Coding agents
  • Cost-sensitive frontier work
  • Cursor and GitHub Copilot users

Watch out

Token rates double above a 200K-token prompt and there is no Batch API; the DeepSWE figure is vendor-reported.

When the cheaper one wins

Grok 4.7 is cheaper on output at $6 per million tokens against $50 for Claude Fable 5 — about 8.3×. Use the cheaper tier for classification, extraction, summarisation, and any task where the expensive model’s extra score does not change the accepted output. The expensive one only pays if your hardest task actually fails on the cheap tier. These are standard-tier API rates, excluding batch and cache discounts.

Run the model picker

Evidence confidence: High

How strong and complete the evidence behind this comparison is — not a prediction of which model is better.

  • Pricing verified on both sides — Input and output rates are verified for both models.
  • 3/5 core specs verified on both sides — Not published for at least one side: max output, parameter count.
  • 1 shared named benchmark with differing scores — Measured on: Artificial Analysis Intelligence Index.
  • Verified within the last 90 days — Newest catalog check was 2 days ago.
  • Both models carry source citations — Each side has at least two catalog sources on record.

Source receipts

Each catalog figure was checked against the provider or an independent second source on the date shown.

Related comparisons

Diving deeper on one model? Claude Fable 5 · Grok 4.7

Common questions

Claude Fable 5 vs Grok 4.7

Answered from the verified figures on this page rather than general guidance.

Is Claude Fable 5 or Grok 4.7 cheaper for input?
Grok 4.7 is cheaper at $2 per million input tokens, against $10 for Claude Fable 5 — roughly 5.0× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Claude Fable 5 has tiered pricing: Standard $10/$50 per MTok; cache reads 10% of base input. Sibling Claude Mythos 5 is invite-only cyber-defense. Access briefly suspended 2026-06-12, redeployed 2026-07-01. Grok 4.7 has tiered pricing: $2/$6 per MTok (<200K prompt); $4/$12 for all tokens at ≥200K. Cached input $0.50/MTok ($1.00 at ≥200K). US regional endpoint 1.1x. No Batch API; the 2x-price 'Fast' variant is Cursor and Grok Build only. xAI lists no separate text-output cap. Knowledge cutoff May 2026.
Is Claude Fable 5 or Grok 4.7 cheaper for output?
Grok 4.7 is cheaper at $6 per million output tokens, against $50 for Claude Fable 5 — roughly 8.3× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Claude Fable 5 has tiered pricing: Standard $10/$50 per MTok; cache reads 10% of base input. Sibling Claude Mythos 5 is invite-only cyber-defense. Access briefly suspended 2026-06-12, redeployed 2026-07-01. Grok 4.7 has tiered pricing: $2/$6 per MTok (<200K prompt); $4/$12 for all tokens at ≥200K. Cached input $0.50/MTok ($1.00 at ≥200K). US regional endpoint 1.1x. No Batch API; the 2x-price 'Fast' variant is Cursor and Grok Build only. xAI lists no separate text-output cap. Knowledge cutoff May 2026.
Which has the larger context window, Claude Fable 5 or Grok 4.7?
Claude Fable 5 accepts 1M tokens against 500K for Grok 4.7. This only matters if you routinely send very long documents or large codebases.
Do Claude Fable 5 and Grok 4.7 support the same reasoning levels?
Claude Fable 5 exposes adaptive, while Grok 4.7 exposes low, medium, high, xhigh.
Should I use Claude Fable 5 or Grok 4.7?
Both sit in the frontier tier, so the choice usually comes down to price and context rather than capability. Claude Fable 5 suits long-running agents; Grok 4.7 suits coding agents.

Next step

Choosing between them

The verified figures that separate this pair, computed from the catalog rather than restated boilerplate.

  • Input price: Grok 4.7 costs $2 per 1M tokens versus $10 for Claude Fable 5 — a 5x difference at the headline tier.
  • Context: Claude Fable 5 takes 1M against 500K for Grok 4.7 — only decisive if your prompts approach the smaller window.
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