Models/OpenAI/GPT-5.6 Sol

GPT-5.6 Sol

Sol is the GPT-5.6 coding sibling: 973B and #18 on /models Top Weekly. Luna is the week-volume card at 5.8T (+19% WoW, not share). Continuum hosts Sol, Terra, and Luna.

01

Identity

1,050,000Context in
128,000Context out
2026-07-09 (OpenRouter created)Released
ProprietaryWeights
Canonical name
GPT-5.6 Sol
Aliases
gpt-5.6-sol, sol, continuum/gpt-5.6-sol
Continuum hosted id
gpt-5.6-sol
OpenRouter slug
openai/gpt-5.6-sol
Hugging Face
None (closed or unpublished)
Modalities
text, image, file
Plan mapping
Codex / ChatGPT plans serve the GPT-5.6 family. Pin with codex -m gpt-5.6-sol. See Codex models.
Closed weights Hosted on Continuum Vendor lab

Closed. Same family window as Luna and Terra. Effort ladder includes ultra on Codex; DeepSWE cites max.

Requests over 272k prompt tokens bill the whole request at 2x input / 1.5x output on OpenAI’s published surcharge. Continuum pricing.json records that; ccusage does not.

02

Should I use this for coding agents

Use Sol when Terra already failed or the task is hard reasoning. DeepSWE official: 73% ±3% at max, $8.39 per task, 60k out, 61 steps. Tight CI, fewer steps than the Claude rows.

DeepSWEmini-swe-agent
73%±3%
bench
DeepSWE
version
v1.1
split
public 113 tasks
harness
mini-swe-agent
effort
max
n
113
metric
Pass@1
value
73%
ci
±3%
$/task
$8.39
tokens
60k out
steps
61
independent as of 2026-08-13 source
Artificial Analysispublished integer
61
bench
Artificial Analysis
version
Intelligence Index
harness
published integer
metric
Intelligence Index
value
61
independent as of 2026-08-19 source
Vals Indexvals.ai card
63.71%
bench
Vals Index
version
hero index
harness
vals.ai card
metric
Vals Index
value
63.71%
independent as of 2026-08-19 source

Ranked view: Best coding models: the independent leaderboard puts this row and every other card that carries an independent coding score on one board, with the confidence intervals left visible.

03

When not to use it

Trust this before you buy

  • Do not default Sol. Luna is 25× cheaper on the official list and has its own DeepSWE row at 67% / $0.61. Terra is the daily driver.
  • Official OpenAI list is $5 / $30. OpenRouter’s catalog row is $2.50 / $15. Those are two published tables. Do not collapse them, and do not assume Continuum bills the cheaper one.
  • Requests over 272k prompt tokens bill the whole request at 2× input / 1.5× output on OpenAI’s published surcharge.
  • Closed weights. No local checkpoint and no official GGUF. Sibling: Luna for mechanical volume (hosted gpt-5.6-luna), Terra for balanced work (gpt-5.6-terra). Official DeepSWE row is max.

Plus is $25/mo with $25 weekly hosted usage. The Mac app stays free with your own keys. Get Plus is not Download for Mac.

04

Artifact

Weights

OpenAI does not publish Sol weights. No HF Files button. Get Plus is hosted inference.

  • Official OpenAI pricing.md, fetched 19 Aug 2026: Sol $5 input / $0.50 cached input / $6.25 cache write / $30 output per million. Long-context (≥272k) $10 / $1 / $12.50 / $45. Batch endpoint is listed as Supported: no separate batch dollar table printed on that page.
  • OpenRouter catalog 19 Aug 2026: $2.50 / $15, with the same 272k 2× / 1.5× surcharge shape. That catalog pair is not the official $5 / $30 list. Cite both; do not pick a winner.

What you can open

Lab card and OpenRouter listing only. No Hugging Face Files button, because there is no official repo to point at.

Fetched OpenRouter catalog on 2026-08-19. hugging_face_id was empty.

05

Continuum serving

Continuum hosts gpt-5.6-sol, plus Terra and Luna, on the 19 Aug 2026 public allowlist.

Continuum hosted id gpt-5.6-sol

click to select

We list first-party and OpenRouter, plus Continuum only when the live public allowlist named the id. This is not a 15-host routing table.

06

Economics

DeepSWE official: $8.39 per task at max (60k out, 61 steps). That is the hero economics number.

Official OpenAI pricing.md, 19 Aug 2026: $5 / $30 per million; cache $0.50 / $6.25 write; ≥272k $10 / $45. Continuum’s rate card matches that official list.

OpenRouter catalog 19 Aug 2026 prints $2.50 / $15 for openai/gpt-5.6-sol. That is a second published table, not a typo of $5 / $30. Luna’s official list is $0.20 / $1.20. Do not paste Sol onto Luna or the reverse.

Price this model Opens the pricing calculator preloaded with GPT-5.6 Sol.

Artificial Analysis footnote, 19 Aug 2026: about $1.23 per AA task, 66.0 tok/s. The AA tile is Intelligence Index 61. AA did not publish a DeepSWE-style CI or step count we will copy onto the chip. Do not average AA cost with DeepSWE $8.39/task.

07

Provenance

ClaimSourceAs of
DeepSWE 73% ±3% at maxDeepSWE official board2026-08-13
Official Sol $5 / $0.50 cached / $6.25 write / $30 out; ≥272k $10 / $1 / $12.50 / $45; Batch SupportedOpenAI pricing.md2026-08-19
OR catalog $2.50 / $15 for openai/gpt-5.6-sol (not the official $5 / $30)OpenRouter catalog2026-08-19
Hosted id gpt-5.6-solGET /v1/chat/hosted/models/public2026-08-19
OpenRouter id openai/gpt-5.6-sol, context 1,050,000OpenRouter /api/v1/models2026-08-19
08

Compare, FAQ, and Get Plus

Same official DeepSWE harness (mini-swe-agent, public 113 tasks), fetched 2026-08-19. Different effort labels are the lab's own setting on that board, shown here rather than normalized.

Continue through OpenAI's model family with GPT-5.6 Terra.

FAQ

Why card Sol when Luna won the week?

Week tokens measure routing volume. Luna is the flagship card. Sol stays because it is the coding sibling Continuum also hosts.

Why two Sol prices?

Official OpenAI pricing.md is $5 / $30. OpenRouter’s catalog row is $2.50 / $15. We cite both. Continuum’s rate card follows the official list.

Why does the lab blog disagree with DeepSWE or Scale?

Lab posts pick a harness, an effort, a split, and sometimes a private eval set. DeepSWE publishes the official mini-swe-agent row with cost, tokens, and steps. Scale SWE-bench Pro only counts when the public shared-harness board has a row we can fetch. A higher lab number is usually a different test, not a better one.

OpenAI-compatible call

Verified against the live public allowlist on 2026-08-19. Base URL is https://continuumcode.ai/v1. Keys are cont_sk_ from Settings, Account, Inference API. Personal keys need Plus or above.

curl https://continuumcode.ai/v1/chat/completions \
  -H "Authorization: Bearer $CONTINUUM_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gpt-5.6-sol","messages":[{"role":"user","content":"Review this diff."}]}'

Plus is $25/mo with $25 weekly hosted usage. The Mac app stays free with your own keys. Get Plus is not Download for Mac.