AI model comparison
GPT-6.1 Terra vs Muse Spark 1.3
Side by side comparison of GPT-6.1 Terra and Muse Spark 1.3 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
Muse Spark 1.3 is a multimodal reasoning model from Meta for long-running agentic, multi-agent, and coding workflows.
- Input / 1M
- $1.25
- Output / 1M
- $4.25
- Context
- 1.05M
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
1.0x cheaper for a typical chat
Higher intelligence score
Tie
Both scored 48.1 on Artificial Analysis
Larger context window
GPT-6.1 Terra
1.05M vs 1.05M 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 Terra48.1Coding index
GPT-6.1 TerraNot availableAgentic index
GPT-6.1 TerraNot availablePricing
GPT-6.1 Terra vs Muse Spark 1.3 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-6.1 Terra | |
|---|---|---|
| Input tokensPer 1M tokens | $1 | $1.25 |
| Output tokensPer 1M tokens | $5 | $4.25 |
| Cached input (read)Per 1M tokens | $0.05 | $0.15 |
| Cache writePer 1M tokens | $1.25 | Not available |
| 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 | $0.0025 |
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$4.50Coding task
30K in, 4K out
GPT-6.1 Terra$50$21.50 cachedLong document summary
150K in, 2K out
GPT-6.1 Terra$160$17.50 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 | |
|---|---|---|
| Context window | 1.05M tokens | 1.05M tokens |
| Max output | 128K tokens | 944K tokens |
| Input types | File, Image, Text | File, Image, Text, Video |
| Output types | Text | Text |
| Reasoning effort levels | Max, Extra high, High, Medium, Low, None | Max, Extra high, High, Medium, Low, Minimal |
| Default reasoning effort | Medium | Medium |
| Release date | October 26, 2026 | September 2, 2026 |
Features
Supported features
API features available for each model.
| Metric | GPT-6.1 Terra | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Supported |
| Stop sequences | Not supported | Not supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Muse Spark 1.3 vs Claude Opus 5.5
- Muse Spark 1.3 vs Claude Sonnet 5.5
- Muse Spark 1.3 vs Kimi K3.1 Pro
- Muse Spark 1.3 vs Claude Fable 5.1
- Muse Spark 1.3 vs GPT-6 Astra
- Muse Spark 1.3 vs Gemini 4 Argon
- Muse Spark 1.3 vs GPT-6.1 Sol
- Muse Spark 1.3 vs Claude Opus 5
- Muse Spark 1.3 vs Claude Fable 5
- Muse Spark 1.3 vs GPT-6 Sol
- Muse Spark 1.3 vs Grok 4.7
- Muse Spark 1.3 vs MiMo-V2.6-Pro
- Muse Spark 1.3 vs Qwen3.8 Max (0902)
- Muse Spark 1.3 vs GLM 5.3
- Muse Spark 1.3 vs Grok 4.6
- Muse Spark 1.3 vs Step 5 Preview
- Muse Spark 1.3 vs Gemini 3.8 Flash
Our take
GPT-6.1 Terra is 1.0x cheaper for a typical chat. GPT-6.1 Terra has the larger context window (1.05M vs 1.05M 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 Muse Spark 1.3 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 Muse Spark 1.3 costs $1.25 per 1M input tokens and $4.25 per 1M output tokens.
Which has a bigger context window, GPT-6.1 Terra or Muse Spark 1.3?
GPT-6.1 Terra supports up to 1.05M tokens of context, compared with 1.05M for Muse Spark 1.3.
Is GPT-6.1 Terra smarter than Muse Spark 1.3?
On the Artificial Analysis Intelligence Index, GPT-6.1 Terra and Muse Spark 1.3 both score 48.1. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use GPT-6.1 Terra and Muse Spark 1.3 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GPT-6.1 Terra and Muse Spark 1.3 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to GPT-6.1 Terra and Muse Spark 1.3 at the same time. Compare the answers side by side and keep the best one.