text model comparison
Claude Fable 5.1 vs Gemini 4 Argon
Claude Fable 5.1 and Gemini 4 Argon are both current text models, from Anthropic and Google. Gemini 4 Argon is 80% cheaper per 1M input tokens than Claude Fable 5.1, $2 vs $10. On Arena Text, Claude Fable 5.1 scores 1501 Elo and Gemini 4 Argon 1525 Elo (Arena, measured October 8, 2026).
Data verified October 13, 2026 · Dataset 2026-10-13
Side by side
Standard-tier prices in effect today. The better value in each row is highlighted.
| Fact | Claude Fable 5.1 | Gemini 4 Argon |
|---|---|---|
| Price per 1M input tokens | $10 | $2 (better) |
| Price per 1M output tokens | $50 | $10 (better) |
| Cost of 10M input and 2M output tokens | $200 | $40 (better) |
| Arena Text | 1501 Elo (#4 of 49) | 1525 Elo (#1 of 49) (better) |
| FrontierMath Tiers 1-3 (v2) | 90.2% (#4 of 40) | Not measured |
| SimpleQA Verified | 70.8% (#5 of 36) | Not measured |
| Provider | Anthropic | |
| Release date | September 1, 2026 | September 30, 2026 |
| Access | API only | API only |
| Context window | 1,000,000 tokens | Not reported |
| Max output | 128,000 tokens | 1,000,000 tokens |
| Input | text, image | text, image, video |
| Output | text | text |
When to choose each
Claude Fable 5.1
Best for
- Long-horizon agentic coding where a large prompt prefix is replayed across many turns
- Work where Claude Opus 5 at higher effort has already been evaluated and fell short
Watch out for
- Base input and output pricing is unchanged from Fable 5 at $10 / $50; the saving is entirely in cache reads, so a workload with little cache reuse sees no discount
- The 4.7-generation tokenizer produces roughly 30% more tokens for the same text than Claude Sonnet 4.6 and earlier, so per-token rates are not directly comparable across generations
- Anthropic’s launch comparisons are self-reported and were not reproduced independently here
Gemini 4 Argon
Best for
- Long-horizon coding and knowledge work once it reaches general API access
Watch out for
- Access is limited: Google is rolling it out first to cyber defenders in its Fairwind Program, and no Gemini API model id or pricing page entry exists yet
- The $2 input and $10 output rate is introductory with no end date; Google says $4 and $20 per 1M tokens applies afterwards
- Google has not published the context window
Claude Fable 5.1 vs Gemini 4 Argon FAQ
Which is cheaper, Claude Fable 5.1 or Gemini 4 Argon?
Gemini 4 Argon is 80% cheaper per 1M input tokens than Claude Fable 5.1, $2 vs $10. For 10M input and 2M output tokens, Claude Fable 5.1 costs $200 and Gemini 4 Argon $40 at standard rates.
Which scores higher on independent benchmarks, Claude Fable 5.1 or Gemini 4 Argon?
Gemini 4 Argon leads on Arena Text, 1525 Elo to 1501 Elo. Scores are independent evaluations, not either vendor's launch figures.
Related comparisons
- Claude Fable 5.1 vs Claude Mythos 5.1
- Claude Fable 5.1 vs Claude Opus 4.8
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Fable 5.1 vs Granite 4.2 30B
- Claude Fable 5 vs Claude Fable 5.1
- Claude Fable 5 vs Gemini 4 Argon
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Claude Sonnet 5 vs Gemini 4 Argon
- Gemini 4 Argon vs GPT-4.1
Production evaluation
Choosing between Claude Fable 5.1 and Gemini 4 Argon?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty