Muse Spark 1.3
No extra published tiers, cache components, Batch rates, or time-based rates are listed.
Muse Spark 1.3 vs GPT-6.1 Terra API Pricing
Compare verified published API prices for Muse Spark 1.3 and GPT-6.1 Terra. This page compares price, not output quality.
Verified Oct 29, 2026, Muse Spark 1.3 lists input at $1.25 and output at $4.25 per 1M tokens, while GPT-6.1 Terra lists $1.00 input and $5.00 output. GPT-6.1 Terra is 20% cheaper for input, while Muse Spark 1.3 is 15% cheaper for output; costs meet at 3 input tokens per output token, and this does not compare output quality.
| Model | Input $/1M | Cached input $/1M | Output $/1M | Source | Last verified How we verify |
|---|---|---|---|---|---|
| Muse Spark 1.3 | $1.25 | $0.15 | $4.25 | Official source | Oct 29, 2026 |
| GPT-6.1 Terra | $1.00 | $0.05 | $5.00 | Official source | Oct 27, 2026 |
Prices from official provider pages, verified on the date shown.
Published rates
Side-by-side API pricing
| Field | Muse Spark 1.3 | GPT-6.1 Terra |
|---|---|---|
| Provider | Meta | OpenAI |
| Input / 1M | $1.25 | $1.00 |
| Cached input / 1M | $0.15 | $0.05 |
| Output / 1M | $4.25 | $5.00 |
| Batch input / 1M | Not listed | $0.50 |
| Batch output / 1M | Not listed | $2.50 |
| Context window | 1,048,576 | 1050K |
| Release date | Not listed | Oct 26, 2026 |
| Official source How we verify | Meta pricing ↗ | OpenAI pricing ↗ |
Standard token prices
Which is cheaper depends on your input:output ratio
Costs below allocate 1M total tokens across each input:output ratio. They use standard prices only, without cache or Batch discounts.
| Input:output ratio | Muse Spark 1.3 | GPT-6.1 Terra | Cheaper published price |
|---|---|---|---|
| 10:1 (RAG / long context) | $1.52 | $1.36 | GPT-6.1 Terra by 10.4% |
| 3:1 (chat) | $2.00 | $2.00 | Same price |
| 1:1 | $2.75 | $3.00 | Muse Spark 1.3 by 8.3% |
| 1:3 (long generation) | $3.50 | $4.00 | Muse Spark 1.3 by 12.5% |
The standard prices break even at exactly 3 input tokens per output token. On either side of that mix, the model with the lower weighted list price changes.
Computed examples
Monthly cost for real workloads
| Workload | Assumed volume | Muse Spark 1.3 | GPT-6.1 Terra | Difference |
|---|---|---|---|---|
| Side project | 10,000 requests/month | $22.75 | $23.00 | Muse Spark 1.3 by $0.25 (1.1%) |
| Customer support chatbot | 10,000 conversations/month | $197.96 | $175.65 | GPT-6.1 Terra by $22.31 (11.3%) |
| Agent task | 1,000 tasks/month | $28.60 | $28.00 | GPT-6.1 Terra by $0.60 (2.1%) |
Assumptions
- Side project: 10,000 requests per month, with 800 input and 300 output tokens per request.
- Customer support chatbot: 10,000 conversations, with 6 replies per conversation, 600 system tokens, 90 user-message tokens, 1,000 retrieved-context tokens, 180 output tokens per reply, and 50% history carry.
- Agent task: 1,000 tasks, with 8 calls per task and 1,500 input plus 400 output tokens per call.
- All three rows use standard non-cached, non-batch prices and exclude retries, tools, storage, and taxes.
Provider conditions
Pricing rules that can change the answer
GPT-6.1 Terra
Long-context pricing tiers
| Tier | Input | Cached input | Output |
|---|---|---|---|
| Long context | $2.00 | $0.10 | $7.50 |
| Short context | $1.00 | $0.05 | $5.00 |
Batch API: input $0.50 and output $2.50 per 1M tokens.
Verified changes
Price history
First observed on Oct 28, 2026; Meta did not publish an effective date. Meta added Muse Spark 1.3 with published input $1.25 and output $4.25 per 1M tokens.
View this update in the price monitorOn Oct 26, 2026, OpenAI added GPT-6.1 Terra with published input $1.00 and output $5.00 per 1M tokens.
View this update in the price monitor
Operational costs
Cheaper per token is not always cheaper per task
Retries, failed calls, fallback requests, and longer outputs can raise the cost of completing a task even when the published token price is lower. Model the effect with the LLM Retry & Fallback Cost Calculator, read the cost-per-successful-task guide, or estimate a migration with the Model Switch Cost Calculator.
Primary evidence and next steps
Related
Common questions
Frequently asked questions
Is Muse Spark 1.3 cheaper than GPT-6.1 Terra?
GPT-6.1 Terra is 20% cheaper on input. Muse Spark 1.3 is 15% cheaper on output. This compares published list prices, not output quality.
How much do Muse Spark 1.3 and GPT-6.1 Terra cost for 10,000 requests a month?
At 800 input and 300 output tokens per request, Muse Spark 1.3 costs about $22.75 and GPT-6.1 Terra costs about $23.00 at standard list prices.
Which is cheaper for input-heavy workloads like RAG?
At a 10:1 input-to-output token ratio, Muse Spark 1.3 costs $1.52 and GPT-6.1 Terra costs $1.36 per 1M total tokens. GPT-6.1 Terra by 10.4%.
Where do these prices come from?
The prices come from Meta and OpenAI official pricing sources, verified on Oct 29, 2026 and Oct 27, 2026, respectively.
See the pricing verification methodology and AI API pricing dataset.