RETIRED OCT 30 2026ARCHIVEDOPENAI-COMPATIBLECACHED INPUT -90%KOREA - UPSTAGE
Solar Pro 3 API Pricing
Solar Pro 3 is retired. Upstage ended service for it on October 30, 2026 (KST): its pricing card carries the date, and its model history lists the last build, solar-pro3-260323, as deprecated that day. Upstage tells users to migrate to Solar Pro 4. Its last rates were $0.15/M input, $0.015/M cached input and $0.60/M output - half Solar Pro 4's list rate on every dimension, so the move doubles the per-token bill at list. Checked by hand against upstage.ai.
Input - per 1M tokens
$0.15/M
Half of Solar Pro 4 list
Output - per 1M tokens
$0.60/M
Half of Solar Pro 4 list
Cached input
$0.015/M
Prompt cache Upstage row -90%
Effective - agentic blend
$0.0842/M
92/8 split - 82% cache
§ 01 / TERMINAL
Solar Pro 3 API cost calculator.
Calculator pre-loaded with Solar Pro 3's last rates, for sizing the move: Solar Pro 4 lists at twice these rates, Solar Mini 4 at two-thirds.
$ /mo
Workload split
Prompt cache hit rate
Tokens you can process
—
Words equivalent (English)
—
Effective rate
—
§ 02 / SCENARIOS
Solar Pro 3 cost on real workloads.
CODING AGENT
Repo implementation
$0.011/task
LONG DOC
Pull request review
$0.012/review
RAG SUPPORT
Knowledge base answer
$0.00091/query
ASSISTANT
Support assistant
$0.00191/turn
Estimate · solar-tokenizer-estimate · ≈3.8 chars/token Auto-counts as you type
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
Characters 365
Words 59
Tokens (estimated) 96 tokens
Cost as input · uncached $0.00001 USD
Cost as output · uncached $0.00006 USD
Cost as cached input $0.000001 USD
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Solar Pro 4 | $0.30 cache $0.06 | $1.20 | $0.191 +2.3× · promo | 512K | Upstage's named replacement |
| Solar Pro 3 Current | $0.15 cache $0.015 | $0.60 | $0.0842 agentic 92/8 | 128K | Reasoning and instruction following |
| Solar Mini 4 | $0.10 cache $0.01 | $0.40 | $0.0561 −33% | 512K | Cheaper Upstage path, 512K window |
| GLM-5.3 | $1.40 cache $0.26 | $4.40 | $0.78 +9.3× | 1M | Z.ai's current GLM flagship |
Solar Pro 3 API pricing FAQ.
Solar Pro 3 pricing questions, and how it sits against the rest of the Solar line.
Q · 01 How much does Solar Pro 3 cost? +
$0.15/M input, $0.015/M cached input and $0.60/M output, from Upstage's own rate card. No discount is attached to this model.Q · 02 When was Solar Pro 3 retired? +
Upstage ended service for Solar Pro 3 on October 30, 2026 (KST). Its model history lists the last build,
solar-pro3-260323, as deprecated on that date, and Upstage said requests naming it would return an error afterwards; the pricing card shows the same end-of-service date. Upstage's instruction is to migrate to the solar-pro4 alias. The notice was not on the pricing page in an Internet Archive capture of September 26, 2026, and we first saw it on October 10.Q · 03 What should I move to, and what will it cost? +
Upstage names Solar Pro 4:
$0.30/M input and $1.20/M output at list, twice this model's rates, with a 512K window against 128K here. It reasons by default and bills reasoning tokens as output, so re-run cost baselines after the switch. If price matters more than capacity, Solar Mini 4 lists at $0.10 / $0.40 with the same 512K window, but it is a much smaller model (3B active parameters) and not the one Upstage names for this migration.Q · 04 Was Solar Pro 3 cheaper than Solar Pro 4? +
On list price, yes - it was exactly half on every dimension:
$0.15 / $0.60 here against $0.30 / $1.20. Solar Pro 4's 70% launch discount ran through October 10, 2026; since October 11 Upstage bills it at 50% off ($0.15 / $0.60) until further notice instead of returning to list. The comparison ended on October 30, 2026, when Solar Pro 3 left service and Solar Pro 4 became the model Upstage points to.Q · 05 How does it differ from the other Solar tier at this price? +
Solar Pro 2 and Solar Pro 3 carry an identical rate card. Upstage positions Pro 3 as the newer build with stronger reasoning and instruction following, and Pro 2 as the enterprise generation before it. Both ended service on the same day, October 30, 2026 (KST), and Upstage points both to Solar Pro 4.
Q · 06 What context window does it have? +
128K - 128,000 tokens. Upstage's model history page gives that figure for Solar Pro 3 along with 102B total and 12B active parameters. We could not find it on any first-party page when this model was added on August 16, 2026, and the docs page we checked then no longer exists.
Q · 07 How was it called? +
The API is OpenAI-compatible: the OpenAI SDK pointed at
https://api.upstage.ai/v1 with solar-pro3 as the model name. Upstage said requests naming the last build would return an error after end of service, so change the model name to solar-pro4.