GPT-5.6 Sol Pricing

GPT-5.6 Sol API pricing

GPT-5.6 Sol API pricing is $5 per million input tokens and $30 per million output tokens, verified November 1, 2026.

Input (per 1M tokens)

$5

Output (per 1M tokens)

$30

Cached input (per 1M tokens)

$0.5

Batch discount

50%

Context window

1,048,576 tokens

Max output

128,000 tokens

Released

July 9, 2026

Capabilities

GPT-5.6 Sol supports extended reasoning, image input, tool use, long context.

GPT-5.6 Sol API pricing has changed 5 times on record, most recently on October 13, 2026 (increase).

• October 13, 2026: Increase — input $4 → $5/M (+$1) — output $20 → $30/M (+$10)
• October 12, 2026: Decrease — input $5 → $4/M (−$1) — output $30 → $20/M (−$10)
• October 4, 2026: Increase — input $4 → $5/M (+$1) — output $20 → $30/M (+$10)
• August 31, 2026: Decrease — input $4/M — output $20/M
• August 21, 2026: Decrease — input $5 → $4/M (−$1) — output $30 → $20/M (−$10)

Frequently asked questions

Short answers to the most common questions about GPT-5.6 Sol pricing, limits, and capabilities.

Notes

PROMOTIONAL PRICE CUT 2026-08-21: OpenAI cut Sol input $5 -> $4, output $30 -> $20 (>20% cut). Announced as promotional, valid through at least 2026-11-21, applied to pay-as-you-go API + Codex credits + eligible ChatGPT Work plans. Pro/Plus/Business subs unchanged. Result: Sol now costs LESS than Claude Opus 5 on both input and output, first time in the lineup's history. This is a defensive move against DeepSeek V4-Pro and Anthropic's Sonnet 5 hold at $2/$10. Confirmed via multiple 2026-08-21+ sources including Enterprise DNA, Technology.org, DigitalApplied. [2026-08-31] Cache Read fell $0.50 -> $0.40 per MTok. The 2026-08-21 cut also moved cached input in step with the 20% input reduction (cache reads bill at 1/10th of the $4 input rate). Corroborated by cellcog.ai/blog/gpt-5-6-pricing, orcarouter.ai/blog/gpt-5-6-sol-pricing and openrouter.ai/openai/gpt-5.6-sol. Standard input $4 / output $20 re-verified unchanged. [2026-10-04] PROMO ENDED EARLY — input $4 -> $5, output $20 -> $30, cache read $0.40 -> $0.50. Read directly from openai.com/api/pricing, which now lists Sol at Input $5.00 / Cached input $0.50 / Output $30.00 per 1M tokens (standard processing, context under 270K). The August promotional rate was advertised as running through at least 2026-11-21, so this is roughly seven weeks earlier than announced. Sol is once again more expensive than Claude Opus 5 on both input and output, reversing the August position. Luna ($0.20/$1.20) and Terra ($2.00/$12.00) were re-read on the same page and are UNCHANGED, so this is specific to the flagship tier, not a lineup-wide move. Snapshot row written, direction Increase. Worth a newsletter mention: a promo ending early is a price rise that vendors do not announce. [2026-10-09] Verification attempt produced no clear result — recheck next run. CONFLICT: search snippet of the official model page (developers.openai.com/api/docs/models/gpt-5.6-sol) still shows $4 / $20 / cached $0.40 with promo 'through at least Nov 21', and news coverage (fourweekmba, pasqualepillitteri, sentisense) describes the promo as running to Nov 21 — contradicting the 2026-10-04 read of openai.com/api/pricing at $5/$30. Could be a stale snippet or a reversal; no source this run confirms the early end. Prices LEFT at $5/$30/$0.50. Needs a direct read of openai.com/api/pricing. [2026-10-11] Verification attempt produced no clear result — recheck next run. CONFLICT PERSISTS AND STRENGTHENS: developers.openai.com/api/docs/pricing snippet quoted as listing Sol at $4.00 / $20.00 'promotional pricing available at least through November 21, 2026'; orcarouter, benchlm (Oct 2026 table, cached $0.40) and a GitHub issue (usertools-ai/usertrust #265: 'gpt-5.6-sol is $4/$20 on OpenAI's page') agree. No source this run supports the 10-04 early-end read. Separately, orcarouter claims GPT-6.1 Sol now holds the flagship slot. Prices LEFT at $5/$30/$0.50 per no-guess rule, but evidence now favours $4/$20/$0.40. ACTION FOR KHALED: direct read of openai.com/api/pricing — if $4/$20, revert and write a Decrease snapshot. [2026-10-12] REVERTED TO PROMO RATE — Input $5 → $4, Output $30 → $20, Cache Read $0.50 → $0.40. Three OpenAI-domain sources agree this run: the model page (developers.openai.com/api/docs/models/gpt-5.6-sol: Input $4.00 / Cached $0.40 / Output $20.00), the pricing page (developers.openai.com/api/docs/pricing, 'promotional pricing available at least through November 21, 2026') and the API changelog (cut effective Aug 2026). Corroborated by orcarouter.ai and actuia.com's 2026-10-06 rate-card table. No source this run supports the 10-04 $5/$30 read, which now looks like a misread or a briefly-reverted page. Snapshot written, direction Decrease. Still worth a 30-second eyeball of the live pricing page. Also: OpenAI has launched GPT-6.1 Sol at $2/$10 (cached $0.10), half this promo rate — Sol 5.6 is no longer the flagship. [2026-10-13] Input $4 → $5, Output $20 → $30, Cache Read $0.40 → $0.50 per https://openai.com/api/pricing/ (direct read this run: GPT-5.6 Sol Input $5.00 / Cached $0.50 / Output $30.00, standard, context under 270K). CAVEAT: https://developers.openai.com/api/docs/pricing this run lists only 'gpt-5.6-sol (Cyber)' at $4.00/$20.00/$0.40 (a differently labelled SKU, not plain Sol) and lists GPT-6.1 Sol at $2/$10. The allowlisted flagship page is treated as authoritative for plain 'GPT-5.6 Sol'; recheck if the promo flips back. US-only Multiplier filled: 1.1 (data residency +10%) per openai.com/api/pricing. [2026-10-15] Verification attempt produced no clear result — recheck next run. Official sources conflict again: developers.openai.com/api/docs/models/gpt-5.6-sol, the OpenAI community announcement (20% cut, through at least Nov 21) and orcarouter all show $4 / $20 / cached $0.40, while the 10-13 direct read of openai.com/api/pricing showed $5 / $30 / $0.50. Prices LEFT at $5/$30/$0.50. Stored price has flipped three times since 10-04 — manual check of both OpenAI pages needed before any further change. [2026-10-16] Verification attempt produced no clear result — recheck next run. Still split: Requesty and OpenRouter list $4/$20/cached $0.40 (cellcog: promo through at least Nov 21); Spheron, Inworld, CloudZero, TechJack list $5/$30. No OpenAI-domain snippet surfaced this run. Prices LEFT at $5/$30/$0.50. Manual check of both OpenAI pages still needed. [2026-10-19] Verification attempt produced no clear result — recheck next run. Same split: most aggregators (cloudzero, layer3labs, techjack, costgoat) list $5/$30/cached $0.50, while some list the $4/$20 promo (one says $4/$20 below the long-context threshold, $8/$30 above). No OpenAI-domain snippet. Prices LEFT at $5/$30/$0.50. Promo window (through at least Nov 21) is still the root cause — manual check of both OpenAI pages needed. [2026-10-20] Verification attempt produced no clear result — recheck next run. OpenAI-domain snippets this run (developers.openai.com/api/docs/pricing + model page, and the ChatGPT Enterprise token rate card on help.openai.com) all show $4 / $20 / cached $0.40 (long context >272K: $8 / $30 / cached $0.80); OpenRouter and cellcog agree. Spheron, Inworld, Layer3, Eden AI, CloudZero still list $5/$30. Still conflicts with the 10-13 direct read of openai.com/api/pricing ($5/$30). Prices LEFT at $5/$30/$0.50. Evidence leans $4/$20 — manual check of openai.com/api/pricing needed. [2026-10-21] Verification attempt produced no clear result — recheck next run. developers.openai.com/api/docs/pricing snippet again lists gpt-5.6-sol at $4.00 / cached $0.40 / $20.00 (promo through at least Nov 21; cache writes 30m $5, 12h $10); OpenAI community post + OpenRouter agree; some aggregators still show $5/$30. Same unresolved conflict with the 10-13 openai.com/api/pricing read. Prices LEFT at $5/$30/$0.50. Note: OpenAI's GPT-6 Sol (gpt-6-sol, $2/$10, launched 2026-09-22) now supersedes this model — consider whether this row still needs weekly tracking. [2026-10-25] Verification attempt produced no clear result — recheck next run. Same split: orcarouter, OpenAI community post and a snippet attributed to OpenAI's Sol page show the $4/$20 promo (cached $0.40; >272K $8/$30) through at least Nov 21; CloudZero (~Oct 22) and TechJack still list $5/$30 'unchanged'. Prices LEFT at $5/$30/$0.50. Promo ends on or after Nov 21, so a manual check of openai.com/api/pricing is still needed.