AI model comparison
GPT-6.1 Terra vs Claude Fable 5.1
Side by side comparison of GPT-6.1 Terra and Claude Fable 5.1 on pricing, benchmark scores, context window, and more.
GPT-6.1 Terra is the mid-tier model in OpenAI's GPT-6.1 series, priced below GPT-6.1 Sol.
- Input / 1M
- $1
- Output / 1M
- $5
- Context
- 1.05M
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual
- Input / 1M
- $10
- Output / 1M
- $50
- Context
- 1M
Comparing image generators? Compare image models
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
GPT-6.1 Terra
10.0x cheaper for a typical chat
Higher intelligence score
GPT-6.1 Terra
51 vs 49.7 on Artificial Analysis
Larger context window
GPT-6.1 Terra
1.05M vs 1M tokens
Newer release
GPT-6.1 Terra
Released October 26, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
GPT-6.1 Terra51
Claude Fable 5.149.7Coding index
GPT-6.1 TerraNot availableClaude Fable 5.180.7Agentic index
GPT-6.1 TerraNot availableClaude Fable 5.157.2Pricing
GPT-6.1 Terra vs Claude Fable 5.1 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-6.1 Terra | Claude Fable 5.1 |
|---|---|---|
| Input tokensPer 1M tokens | $1 | $10 |
| Output tokensPer 1M tokens | $5 | $50 |
| Cached input (read)Per 1M tokens | $0.05 | $0.25 |
| Cache writePer 1M tokens | $1.25 | $12.50 |
| Long-context pricingPer 1M tokens, for very long prompts | $2 in / $7.50 out above 272K | Same rate at any length |
| Web searchPer request | $0.01 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
GPT-6.1 Terra$4.50Claude Fable 5.1$45Coding task
30K in, 4K out
GPT-6.1 Terra$50$21.50 cachedClaude Fable 5.1$500$207.50 cachedLong document summary
150K in, 2K out
GPT-6.1 Terra$160$17.50 cachedClaude Fable 5.1$1600$137.50 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | GPT-6.1 Terra | Claude Fable 5.1 |
|---|---|---|
| Context window | 1.05M tokens | 1M tokens |
| Max output | 128K tokens | 128K tokens |
| Input types | File, Image, Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, Extra high, High, Medium, Low, None | Max, Extra high, High, Medium, Low |
| Default reasoning effort | Medium | High |
| Release date | October 26, 2026 | September 1, 2026 |
Features
Supported features
API features available for each model.
| Metric | GPT-6.1 Terra | Claude Fable 5.1 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Not supported |
| Stop sequences | Not supported | Supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
GPT-6.1 TerraView full model details- GPT-6.1 Terra vs Claude Opus 5.5
- GPT-6.1 Terra vs GPT-6 Astra
- GPT-6.1 Terra vs GPT-6.1 Sol
- GPT-6.1 Terra vs Claude Sonnet 5.5
- GPT-6.1 Terra vs Gemini 4 Argon
- GPT-6.1 Terra vs Kimi K3.1 Pro
- GPT-6.1 Terra vs Muse Spark 1.3
- GPT-6.1 Terra vs Claude Haiku 5.5
- GPT-6.1 Terra vs GPT-6 Luna
- GPT-6.1 Terra vs DeepSeek V4.1 Flash 1017
- GPT-6.1 Terra vs DeepSeek V4.1 Flash
- GPT-6.1 Terra vs GLM 5.3 Flash
- GPT-6.1 Terra vs Hy4 preview
- GPT-6.1 Terra vs GLM 5.2
- GPT-6.1 Terra vs GPT-6 Sol
- GPT-6.1 Terra vs GPT-5.6 Terra
Claude Fable 5.1View full model details- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Fable 5.1 vs GPT-6.1 Sol
- Claude Fable 5.1 vs Claude Sonnet 5.5
- Claude Fable 5.1 vs Gemini 4 Argon
- Claude Fable 5.1 vs Kimi K3.1 Pro
- Claude Fable 5.1 vs Muse Spark 1.3
- Claude Fable 5.1 vs Claude Haiku 5.5
- Claude Fable 5.1 vs Claude Opus 5
- Claude Fable 5.1 vs Claude Sonnet 4.5
- Claude Fable 5.1 vs Claude Opus 4.8
Our take
GPT-6.1 Terra is 10.0x cheaper for a typical chat. GPT-6.1 Terra scores higher on the Artificial Analysis Intelligence Index (51 vs 49.7). GPT-6.1 Terra has the larger context window (1.05M vs 1M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is GPT-6.1 Terra or Claude Fable 5.1 cheaper?
GPT-6.1 Terra is cheaper for a typical chat (2K input tokens and 500 output tokens). GPT-6.1 Terra costs $1 per 1M input tokens and $5 per 1M output tokens, while Claude Fable 5.1 costs $10 per 1M input tokens and $50 per 1M output tokens.
Which has a bigger context window, GPT-6.1 Terra or Claude Fable 5.1?
GPT-6.1 Terra supports up to 1.05M tokens of context, compared with 1M for Claude Fable 5.1.
Is GPT-6.1 Terra smarter than Claude Fable 5.1?
On the Artificial Analysis Intelligence Index, GPT-6.1 Terra scores 51 and Claude Fable 5.1 scores 49.7, putting GPT-6.1 Terra ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use GPT-6.1 Terra and Claude Fable 5.1 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GPT-6.1 Terra and Claude Fable 5.1 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to GPT-6.1 Terra and Claude Fable 5.1 at the same time. Compare the answers side by side and keep the best one.