Models/OpenAI/GPT-5.6 Luna

GPT-5.6 Luna

Luna led OpenRouter This Week at 5.8T (+19% week-over-week, not share). Continuum hosts gpt-5.6-luna. Sol is the coding sibling, not this card.

01

Identity

1,050,000Context in
128,000Context out
2026-07-09 (OpenRouter created)Released
ProprietaryWeights
Canonical name
GPT-5.6 Luna
Aliases
gpt-5.6-luna, luna, continuum/gpt-5.6-luna
Continuum hosted id
gpt-5.6-luna
OpenRouter slug
openai/gpt-5.6-luna
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None (closed or unpublished)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-luna. See Codex models.
Closed weights Hosted on Continuum Vendor lab

Closed. Same 1.05M / 128k window as Sol 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 Luna for mechanical volume and cheap hosted GPT-5.6. DeepSWE official: 67% ±4% at max, $0.61 per task, 73k out, 102 steps. AA Intelligence Index 52. Vals hero index 59.88%.

DeepSWEmini-swe-agent
67%±4%
bench
DeepSWE
version
v1.1
split
public 113 tasks
harness
mini-swe-agent
effort
max
n
113
metric
Pass@1
value
67%
ci
±4%
$/task
$0.61
tokens
73k out
steps
102
independent as of 2026-08-13 source
Artificial Analysispublished integer
52
bench
Artificial Analysis
version
Intelligence Index
harness
published integer
metric
Intelligence Index
value
52
independent as of 2026-08-19 source
Vals Indexvals.ai card
59.88%
bench
Vals Index
version
hero index
harness
vals.ai card
metric
Vals Index
value
59.88%
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

  • If the task already resisted Luna, escalate to Terra or Sol. Sol’s DeepSWE row is 73% ±3% at $8.39/task.
  • Requests over 272k prompt tokens bill the whole request at 2× input / 1.5× output on OpenAI’s published surcharge. That is not the $0.20 / $1.20 list.
  • Closed weights. No local checkpoint and no official GGUF. Retention is OpenAI’s, not yours.
  • Sibling: Sol for hard reasoning (hosted gpt-5.6-sol), Terra for balanced work (gpt-5.6-terra). Official DeepSWE row is max, not a silent default.

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 Luna weights. No HF Files button. Get Plus is hosted inference.

  • Official OpenAI pricing.md, fetched 19 Aug 2026: Luna $0.20 input / $0.02 cached input / $0.25 cache write / $1.20 output per million. Long-context (≥272k) $0.40 / $0.04 / $0.50 / $1.80. Batch endpoint is listed as Supported: no separate batch dollar table printed on that page.
  • OpenRouter catalog 19 Aug 2026: $0.20 / $1.20, cache read $0.02 /M, cache write $0.25 /M, web search $0.01 per call. Override ≥272k: $0.40 / $1.80, cache read/write $0.04 / $0.50. Official and catalog match on this SKU.

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-luna, plus Sol and Terra, on the 19 Aug 2026 public allowlist.

Continuum hosted id gpt-5.6-luna

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: $0.61 per task at max (73k out, 102 steps). That is the cheapest official row among Opus / Sol / Fable / Luna.

Official OpenAI + OpenRouter + Continuum rate card, 19 Aug 2026: $0.20 / $1.20 per million. Cache read $0.02 /M. Cache write $0.25 /M. Web search $0.01 per call on the catalog. ≥272k surcharge is 2× input / 1.5× output. Sol’s official list is $5 / $30. Do not paste it here.

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

Artificial Analysis Intelligence Index 52, fetched 19 Aug 2026. The AA tile is that published integer. AA did not publish a DeepSWE-style CI or step count we will copy onto the chip.

07

Provenance

ClaimSourceAs of
DeepSWE 67% ±4% at maxDeepSWE official board2026-08-13
Official Luna $0.20 / $0.02 cached / $0.25 write / $1.20 out; ≥272k $0.40 / $0.04 / $0.50 / $1.80; Batch SupportedOpenAI pricing.md2026-08-19
OR catalog $0.20 / $1.20, cache r/w $0.02 / $0.25, search $0.01, ≥272k $0.40 / $1.80OpenRouter catalog2026-08-19
Hosted id gpt-5.6-lunaGET /v1/chat/hosted/models/public2026-08-19
5.8T week tokens (+19% WoW)OpenRouter rankings This Week2026-08-19
OpenRouter id openai/gpt-5.6-luna, 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 Sol.

FAQ

Why card Luna instead of Sol?

Luna is the live week-volume slug. Sol stays a sibling card because Continuum hosts it and buyers still search that name.

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-luna","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.