1. Chart data
  2. GPT-5.6 TTFT curves upward with context length; Claude 5 is
Epoch AIScatter plot · 81 points · Epoch AI

GPT-5.6 TTFT curves upward with context length; Claude 5 is much closer to linear

The numbers behind a chart Epoch AI published, redrawn natively. Check the original, study the data, then make your own.

Estimated from the image 46%All chart data
Chart by Epoch AI. Source: x.com

Simplified redraw

Drawn by us from the numbers below. Hover, tap or use the arrow keys.

A simplified redraw: it shows the numbers in our own look, not the look of the original. One accent marks what the chart is about. Values marked with ~ in the table are estimates.

The numbers

First 10 of 81 points are free
GroupSeriesxValue (s)SourceConf.
GPT-5.6 TerraRaw request50~0.5Estimate0.80
GPT-5.6 TerraRaw request100~1Estimate0.80
GPT-5.6 TerraRaw request150~1.5Estimate0.80
GPT-5.6 TerraRaw request200~2Estimate0.80
GPT-5.6 TerraRaw request300~2.75Estimate0.65
GPT-5.6 TerraRaw request400~3.75Estimate0.65
GPT-5.6 TerraRaw request500~4.75Estimate0.65
GPT-5.6 TerraRaw request600~5.75Estimate0.65
GPT-5.6 TerraRaw request700~7Estimate0.80
GPT-5.6 TerraRaw request800~9Estimate0.30

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The full table, the JSON, a CSV and the agent skill file for this chart. These are Max in the plan; while this is a prototype your email unlocks them.

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GPT-5.6 TerraRaw request900~13Estimate0.30
GPT-5.6 TerraStudent-t fit0~0Estimate0.30
GPT-5.6 TerraStudent-t fit100~0.8Estimate0.30
GPT-5.6 TerraStudent-t fit200~1.5Estimate0.30
GPT-5.6 TerraStudent-t fit300~2.2Estimate0.30
GPT-5.6 TerraStudent-t fit400~3Estimate0.30
GPT-5.6 TerraStudent-t fit500~3.8Estimate0.30
GPT-5.6 TerraStudent-t fit600~4.8Estimate0.30
GPT-5.6 TerraStudent-t fit700~6Estimate0.30
GPT-5.6 TerraStudent-t fit800~7.5Estimate0.30
GPT-5.6 TerraStudent-t fit900~9.5Estimate0.30
GPT-5.6 SolRaw request50~1Estimate0.80
GPT-5.6 SolRaw request100~2Estimate0.80
GPT-5.6 SolRaw request200~3Estimate0.80
GPT-5.6 SolRaw request300~4Estimate0.80
GPT-5.6 SolRaw request400~5Estimate0.80
GPT-5.6 SolRaw request500~6.25Estimate0.65
GPT-5.6 SolRaw request600~8Estimate0.80
GPT-5.6 SolRaw request700~10Estimate0.80
GPT-5.6 SolRaw request800~12Estimate0.80
GPT-5.6 SolRaw request900~15Estimate0.80
GPT-5.6 SolStudent-t fit0~0Estimate0.30
GPT-5.6 SolStudent-t fit100~1Estimate0.30
GPT-5.6 SolStudent-t fit200~2Estimate0.30
GPT-5.6 SolStudent-t fit300~3Estimate0.30
GPT-5.6 SolStudent-t fit400~4Estimate0.30
GPT-5.6 SolStudent-t fit500~5.5Estimate0.30
GPT-5.6 SolStudent-t fit600~7Estimate0.30
GPT-5.6 SolStudent-t fit700~9Estimate0.30
GPT-5.6 SolStudent-t fit800~11.5Estimate0.30
GPT-5.6 SolStudent-t fit900~15Estimate0.30
Claude Sonnet 5Raw request50~0.5Estimate0.80
Claude Sonnet 5Raw request100~1Estimate0.80
Claude Sonnet 5Raw request200~1.75Estimate0.65
Claude Sonnet 5Raw request300~2.75Estimate0.65
Claude Sonnet 5Raw request400~3.75Estimate0.65
Claude Sonnet 5Raw request500~4.75Estimate0.65
Claude Sonnet 5Raw request600~5.75Estimate0.65
Claude Sonnet 5Raw request700~7Estimate0.80
Claude Sonnet 5Raw request800~8.25Estimate0.65
Claude Sonnet 5Raw request900~10Estimate0.30
Claude Sonnet 5Student-t fit0~0Estimate0.30
Claude Sonnet 5Student-t fit100~1Estimate0.30
Claude Sonnet 5Student-t fit200~2Estimate0.30
Claude Sonnet 5Student-t fit300~3Estimate0.30
Claude Sonnet 5Student-t fit400~4Estimate0.30
Claude Sonnet 5Student-t fit500~5Estimate0.30
Claude Sonnet 5Student-t fit600~6Estimate0.30
Claude Sonnet 5Student-t fit700~7Estimate0.30
Claude Sonnet 5Student-t fit800~8Estimate0.30
Claude Sonnet 5Student-t fit900~9.5Estimate0.30
Claude Opus 5Raw request50~1Estimate0.80
Claude Opus 5Raw request100~2Estimate0.80
Claude Opus 5Raw request200~3Estimate0.30
Claude Opus 5Raw request300~4Estimate0.30
Claude Opus 5Raw request400~5Estimate0.30
Claude Opus 5Raw request500~6Estimate0.30
Claude Opus 5Raw request600~7Estimate0.30
Claude Opus 5Raw request700~8Estimate0.30
Claude Opus 5Raw request800~10Estimate0.30
Claude Opus 5Raw request900~12Estimate0.30
Claude Opus 5Student-t fit0~0Estimate0.30
Claude Opus 5Student-t fit100~1.5Estimate0.30
Claude Opus 5Student-t fit200~3Estimate0.30
Claude Opus 5Student-t fit300~4.5Estimate0.30
Claude Opus 5Student-t fit400~6Estimate0.30
Claude Opus 5Student-t fit500~7.5Estimate0.30
Claude Opus 5Student-t fit600~9Estimate0.30
Claude Opus 5Student-t fit700~11Estimate0.30
Claude Opus 5Student-t fit800~13Estimate0.30
Claude Opus 5Student-t fit900~15Estimate0.30
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On the Max plan you can pull this chart's numbers with the provenance of each one, as JSON or CSV, with its redraw spec, or call it from an agent over MCP. Chart id ef63ad463f11.

Approximate values. Our two readings of this chart agreed only in part (confidence 0.46 of 1), so check the original before you quote a number. The API marks it lowConfidence, and ?min_confidence=0.5 leaves it out.

See the Max planAPI docs
PathReturnsPlan
GET/api/v1/charts/ef63ad463f11Title, publisher, date, form, point count; with a Max key, the data linkOpen
GET/api/v1/charts/ef63ad463f11/dataEvery point with its provenance and confidence, plus the redraw spec. Add ?format=csv for CSVMax
GET/api/v1/charts/ef63ad463f11/render?view=1The draw-only view this page usesOpen
POST/mcpTool get_chart_data with this id, for Claude, Cursor and other agentsMax
curlMax
curl -s https://viral-chart.com/api/v1/charts/ef63ad463f11/data \
  -H "Authorization: Bearer $VIRALCHART_KEY"
Claude CodeMax
claude mcp add --transport http viralchart https://viral-chart.com/mcp \
  --header "Authorization: Bearer $VIRALCHART_KEY"

60 requests a minute per key; over that you get 429 with Retry-After. Up to 5 keys per account, made on your account page and shown once. Without Max, the data route answers 402 with a link to the plans. The numbers describe a chart its publisher owns, and every file carries a license note.

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Questions people ask

How accurate are these numbers?

They are estimated from the image by two independent passes, with confidence 0.46 on a 0 to 1 scale. Printed numbers read well; values read off an axis can be a few percent off.

Can I reuse this data?

The numbers describe a chart that Epoch AI published. The image, layout and styling belong to them. Use the numbers with a credit to the publisher, and make your picture from your own data.

How do I get the file?

The JSON, CSV and agent skill file are under the email gate on this page. In this prototype they are static files at /api/charts/ef63ad463f11.json and /api/charts/ef63ad463f11.skill.md.