AI Index

GPT-5.6 TerravsMuse Spark 1.3

Both language models, compared at each maker’s own API list prices. Every figure links to its source.

Compare at your usage

Every model priced for the same request
Prompt per request
Cache hits
Batch
Service tier

8,000 tokens in, 2,000 out

GPT-5.6 Terra on OpenAI APIMuse Spark 1.3 on Meta AI API
Rate appliedBase rateBase rate
Inputper 1M tokens$2.00 $1.25
Cache readper 1M tokens$0.20 $0.15
Outputper 1M tokens$12.00 $4.25
Cost per request$0.040$0.0185
Per 1,000 requests$40.00$18.50

Every model is priced for the same request at its maker’s own list prices (each with its source and date), so bold marks the cheapest. A model that can’t serve the request is named, not ranked; a condition its seller doesn’t price says which rate was used.

Cost per request as prompts grow

2K tokens out, list price on each maker’s API. GPT-5.6 Terra charges $4.00 / $18.00 above 272K tokens.

0$0.50$1.000250K500K750K1Mprompt tokens per request272K8KMuse Spark 1.3$0.0185 at 8KGPT-5.6 Terra$0.040 at 8K
  • GPT-5.6 Terra · OpenAI API
  • Muse Spark 1.3 · Meta AI API

Where each stands among all scored models

Each line runs from the lowest to the highest score on the board; the tick is the median.

Epoch Capabilities Index#14 vs #23 of 118Muse Spark 1.3: 158GPT-5.6 Terra: 160.9LMArena Text#34 vs #10 of 163Muse Spark 1.3: 1,495GPT-5.6 Terra: 1,467LMArena Text · Coding#35 vs #15 of 163Muse Spark 1.3: 1,534GPT-5.6 Terra: 1,517LMArena Vision#31 vs #10 of 89Muse Spark 1.3: 1,308GPT-5.6 Terra: 1,271
  • GPT-5.6 Terra
  • Muse Spark 1.3

Key differences

GPT-5.6 TerraMuse Spark 1.3
InputMaker’s official API · global · USD
$2.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$1.25 / 1M tokens Meta Model API pricing and rate limits · as of Nov 1, 2026
OutputMaker’s official API · global · USD
$12.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$4.25 / 1M tokens Meta Model API pricing and rate limits · as of Nov 1, 2026
Context
1,050,000 GPT-5.6 Terra model · as of Nov 4, 2026
1,048,576 Meta Model API models · as of Nov 1, 2026
Input modalities
Text, Image GPT-5.6 Terra model · as of Nov 4, 2026
Text, Image, Video, PDF, Audio Meta Model API models · as of Nov 1, 2026
Cache readMaker’s official API · global · USD
$0.20 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.15 / 1M tokens Meta Model API pricing and rate limits · as of Nov 1, 2026

These differences use verified vendor specifications or each maker’s official API on the same region, currency, meter and billing conditions. Different conditions remain side by side in the full table; they do not establish which model is cheaper. Declared features describe support, not measured quality or a recommendation. Missing evidence does not mean a feature is unsupported.

Full comparison

GPT-5.6 Terra OpenAI Muse Spark 1.3 Meta
Overview
ReleasedJul 9, 2026 Sep 2, 2026
Open weights— —
Knowledge cutoffFeb 2026 Not stated
Specs
Context1.05M 1.05M
Max input922K Not stated
Max output128K 131.07K
Input modalitiesText, Image Text, Image, Video, PDF, Audio
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortsnone, low, medium, high, xhigh, max minimal, low, medium, high, xhigh, max
Reasoning can be offYes Not stated
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$2.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $1.25
Output price$12.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $4.25
Cache read price$0.20Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $0.15
Cache write pricefrom $2.50Also priced under other conditions: 12-hour cache, Prompts over 272K tokens, Batch, Flex tier, Fast tier30-minute cache —
Blended price (3 input : 1 output)$4.50 $2.00
Pricing under conditions · per 1M tokens
Input price, long prompts$4.00Prompts over 272K tokens Not offered
Output price, long prompts$18.00Prompts over 272K tokens Not offered
Batch input price$1.00Batch Not offered
Batch output price$6.00Batch Not offered
Flex tier input price$1.00Flex tier Not offered
Flex tier output price$6.00Flex tier Not offered
Cited scores
Epoch Capabilities Index160.9 158
LMArena Text1,467 xhigh effort1,495 max effort
LMArena Text · Coding1,517 xhigh effort1,534 max effort
LMArena Vision1,271 xhigh effort1,308 max effort
LMArena Text · Chinese1,516 xhigh effort1,529 max effort
Epoch AI · GPQA Diamond93.3% max effort—
Epoch AI · FrontierMath Tiers 1–386% max effort74.4% xhigh effort

Headline prices may come from different channels, regions or tiers. Check each source before choosing a model; missing facts stay blank.

Model details and sources

Cited scores