AI Index

GPT-5.6 SolvsGPT-6.1 Sol

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 Sol on OpenAI APIGPT-6.1 Sol on OpenAI API
Rate appliedBase rateBase rate
Inputper 1M tokens$4.00 $2.00
Cache readper 1M tokens$0.40 $0.10
Outputper 1M tokens$20.00 $10.00
Cost per request$0.072$0.036
Per 1,000 requests$72.00$36.00

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 Sol charges $8.00 / $30.00 above 272K tokens. GPT-6.1 Sol charges $4.00 / $15.00 above 272K tokens.

0$1.00$2.000250K500K750K1Mprompt tokens per request272K8KGPT-5.6 Sol$0.072 at 8KGPT-6.1 Sol$0.036 at 8K
  • GPT-5.6 Sol · OpenAI API
  • GPT-6.1 Sol · OpenAI 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#11 vs #2 of 118GPT-6.1 Sol: 168.9GPT-5.6 Sol: 163LMArena Text#17 vs #22 of 163GPT-6.1 Sol: 1,481GPT-5.6 Sol: 1,485LMArena Text · Coding#18 vs #10 of 163GPT-6.1 Sol: 1,541GPT-5.6 Sol: 1,533LMArena Vision#25 vs #20 of 89GPT-6.1 Sol: 1,288GPT-5.6 Sol: 1,281
  • GPT-5.6 Sol
  • GPT-6.1 Sol

Key differences

GPT-5.6 SolGPT-6.1 Sol
InputMaker’s official API · global · USD
$4.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$2.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
OutputMaker’s official API · global · USD
$20.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$10.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
Knowledge cutoff
Feb 2026 GPT-5.6 Sol model · as of Nov 1, 2026
Apr 2026 GPT-6.1 Sol · as of Nov 1, 2026
Cache readMaker’s official API · global · USD
$0.40 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.10 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
InputMaker’s official API · global · USD · Batch
$2.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$1.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
Cache readMaker’s official API · global · USD · Batch
$0.20 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.050 / 1M tokens OpenAI API pricing · as of Nov 2, 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 Sol OpenAI GPT-6.1 Sol OpenAI
Overview
ReleasedJul 9, 2026 Sep 29, 2026
Open weights— —
Knowledge cutoffFeb 2026 Apr 2026
Specs
Context1.05M 1.05M
Max input922K 922K
Max output128K 128K
Input modalitiesText, Image Text, Image
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortsnone, low, medium, high, xhigh, max low, medium, high, xhigh, max
Reasoning can be offYes —
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$4.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $2.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier
Output price$20.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $10.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier
Cache read price$0.40Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $0.10Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier
Cache write pricefrom $5.00Also priced under other conditions: 12-hour cache, Prompts over 272K tokens, Batch, Flex tier, Fast tier30-minute cache $2.50Also priced under other conditions: 30-minute cache, 12-hour cache, Prompts over 272K tokens, Batch, Flex tier, Fast tier, Ultrafast tier
Blended price (3 input : 1 output)$8.00 $4.00
Pricing under conditions · per 1M tokens
Input price, long prompts$8.00Prompts over 272K tokens $4.00Prompts over 272K tokens
Output price, long prompts$30.00Prompts over 272K tokens $15.00Prompts over 272K tokens
Batch input price$2.00Batch $1.00Batch
Batch output price$10.00Batch $5.00Batch
Flex tier input price$2.00Flex tier $1.00Flex tier
Flex tier output price$10.00Flex tier $5.00Flex tier
Cited scores
Epoch Capabilities Index163 168.9
LMArena Text1,485 xhigh effort1,481 max effort
LMArena Text · Coding1,533 xhigh effort1,541 max effort
LMArena Vision1,281 xhigh effort1,288 max effort
LMArena Text · Chinese1,540 xhigh effort1,520 max effort
Epoch AI · GPQA Diamond93.5% max effort95.4% max effort
Epoch AI · FrontierMath Tiers 1–389.1% max effort93.7% max 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