Model profile / Upstage

Solar Open 2 250B

Upstage's open-weight 250B-A15B hybrid-attention Mixture-of-Experts model with a 1,000,000-token context window and published high-reasoning English benchmark table.

Release date unavailableOpen weights

Sources & details

Four areas of evidence

The capabilities behind the model.

How the indices work

Reasoning

109.3Index points

Mathematical and scientific problem solving.

This model│ Other models · 155 rated

Score and research range

Full-precision point: 109.29667136454586
Range: 106.68–111.92 · 90% Research Range
Scope: Conditional fuller R0 A

Score includes qualified prediction of missing evidence.

Coding

No current rating

Software engineering and programming.

Awaiting a qualified category score

General

No current rating

Factual reliability and instruction following.

Awaiting a qualified category score

Agentic

No current rating

Tool use, workflows and professional tasks.

Awaiting a qualified category score

6retained native records

6evidence families

Capabilities estimateQualified original evidence across four areas.

Current index snapshot · 2026-09-16. Each category uses its own scale; scores across categories are not directly comparable. Evidence counts describe the retained Capabilities inputs; a family can contain several tasks or configurations. A point lead does not establish superiority.

Performance in context

Capabilities, price & speed.

Explore every model

Solar Open 2 250B is highlighted wherever a compatible measurement is available.

Solar Open 2 250B: No current checkpoint-bound first-party quote qualified from reviewed original sources; retained values are historical only

Lumina Capabilities Index

Capabilities versus API price

The current Capabilities cohort, with this model highlighted.

Lumina

2025+ · 62 models · 1 highlighted

Chart loads as you explore

Solar Open 2 250B: No exact base-profile release and documented 10K output measurement; other effort/protocol/alias records not substituted

Lumina Capabilities Index

Capabilities versus output speed

The current Capabilities cohort, with this model highlighted.

Lumina

2025+ · 72 models · Developer API · 10K · 1 highlighted

Chart loads as you explore

Explore the detail

Sources & model details.

Original evidence, with its context.

Current index evidence 2Scores, research ranges and the sources behind each category.

Capabilities

Score uses the admitted direct native evidence under the selected method.

Exact checkpoint: solar-open2-250b
Method: methods-a4471cee84fd478d2ed3
Range interpretation: C1 native factor under conditional crossed source/family reweighting of admitted fixed-corpus reference and own portfolio
Sources: Artificial Analysis:Artificial Analysis
Source cutoff: {"asOfMeaning":"Selected local candidate: retained historical measurements plus reviewed additions; execution dates remain source-native.","newIdentityRecovery":"2026-09-13T08:41:08.804270+00:00","publicProjectionDate":"2026-09-16T06:02:45.491398+00:00","scoring":"Inherited pinned baseline source vintages plus retained4A/4A.1 originals and SWE owner correction; heterogeneous execution dates, often unknown. Not a claim of simultaneous2026-09-13 execution."}

Explore this index

Reasoning

Score includes qualified prediction of missing evidence.

Exact checkpoint: solar-open2-250b
Method: methods-a4471cee84fd478d2ed3
Range interpretation: Conditional fuller R0 A
Sources: aa
Source cutoff: {"asOfMeaning":"Selected local candidate: retained historical measurements plus reviewed additions; execution dates remain source-native.","newIdentityRecovery":"2026-09-13T08:41:08.804270+00:00","publicProjectionDate":"2026-09-16T06:02:45.491398+00:00","scoring":"Inherited pinned baseline source vintages plus retained4A/4A.1 originals and SWE owner correction; heterogeneous execution dates, often unknown. Not a claim of simultaneous2026-09-13 execution."}

Explore this index

Benchmark measurements 17Published values in each benchmark’s own units.

17 measurements

Solar Open 2 250B published benchmark measurements
Benchmark	Result	Published configuration	Source
AA Long Context Reasoningstandard	62.3%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
AIME 20262026	95.7%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
APEX-Agents-AAstandard	16.6%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
Cultural and Linguistic Intelligence in Koreanstandard	90.7%	Solar Open 2 250B (high)Solar Open 2 card Korean table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
HAE-RAE Math 8Kstandard	92.2%	Solar Open 2 250B (high)Solar Open 2 card Korean table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
KMMLU-Prostandard	78.4%	Solar Open 2 250B (high)Solar Open 2 card Korean table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
GDPval-AA v2 (Elo)v2	1,128 Elo	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
GPQA DiamondDiamond	86.3%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
HMMT Feb 20262602	93.9%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
Humanity's Last Examwithout tools	28.8%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible

Showing 10 of 17 measurements

Specifications & source recordsDocumented model details and original references.

Model ID / checkpoint: upstage/Solar-Open2-250B
Weight access: Open weights
Context window: 1,000,000
Maximum output: Not documented
Modalities: text
Details checked: 15 Aug 2026

Solar Open 2 250B model cardUpstage · checked 15 Aug 2026 · source-checked

Specialist task evidenceSeparate agent runs and execution conditions.

No specialist task observations retained for this model.

All models

Model profile / Upstage

Solar Open 2 250B

Upstage's open-weight 250B-A15B hybrid-attention Mixture-of-Experts model with a 1,000,000-token context window and published high-reasoning English benchmark table.

Release date unavailableOpen weights

Sources & details

Four areas of evidence

The capabilities behind the model.

How the indices work

Reasoning

109.3Index points

Mathematical and scientific problem solving.

This model│ Other models · 155 rated

Score and research range

Full-precision point: 109.29667136454586
Range: 106.68–111.92 · 90% Research Range
Scope: Conditional fuller R0 A

Score includes qualified prediction of missing evidence.

Coding

No current rating

Software engineering and programming.

Awaiting a qualified category score

General

No current rating

Factual reliability and instruction following.

Awaiting a qualified category score

Agentic

No current rating

Tool use, workflows and professional tasks.

Awaiting a qualified category score

6retained native records

6evidence families

Capabilities estimateQualified original evidence across four areas.

Performance in context

Capabilities, price & speed.

Explore every model

Solar Open 2 250B is highlighted wherever a compatible measurement is available.

Solar Open 2 250B: No current checkpoint-bound first-party quote qualified from reviewed original sources; retained values are historical only

Lumina Capabilities Index

Capabilities versus API price

The current Capabilities cohort, with this model highlighted.

Lumina

2025+ · 62 models · 1 highlighted

Chart loads as you explore

Solar Open 2 250B: No exact base-profile release and documented 10K output measurement; other effort/protocol/alias records not substituted

Lumina Capabilities Index

Capabilities versus output speed

The current Capabilities cohort, with this model highlighted.

Lumina

2025+ · 72 models · Developer API · 10K · 1 highlighted

Chart loads as you explore

Explore the detail

Sources & model details.

Original evidence, with its context.

Current index evidence 2Scores, research ranges and the sources behind each category.

Capabilities

Score uses the admitted direct native evidence under the selected method.

Exact checkpoint: solar-open2-250b
Method: methods-a4471cee84fd478d2ed3
Range interpretation: C1 native factor under conditional crossed source/family reweighting of admitted fixed-corpus reference and own portfolio
Sources: Artificial Analysis:Artificial Analysis
Source cutoff: {"asOfMeaning":"Selected local candidate: retained historical measurements plus reviewed additions; execution dates remain source-native.","newIdentityRecovery":"2026-09-13T08:41:08.804270+00:00","publicProjectionDate":"2026-09-16T06:02:45.491398+00:00","scoring":"Inherited pinned baseline source vintages plus retained4A/4A.1 originals and SWE owner correction; heterogeneous execution dates, often unknown. Not a claim of simultaneous2026-09-13 execution."}

Explore this index

Reasoning

Score includes qualified prediction of missing evidence.

Exact checkpoint: solar-open2-250b
Method: methods-a4471cee84fd478d2ed3
Range interpretation: Conditional fuller R0 A
Sources: aa
Source cutoff: {"asOfMeaning":"Selected local candidate: retained historical measurements plus reviewed additions; execution dates remain source-native.","newIdentityRecovery":"2026-09-13T08:41:08.804270+00:00","publicProjectionDate":"2026-09-16T06:02:45.491398+00:00","scoring":"Inherited pinned baseline source vintages plus retained4A/4A.1 originals and SWE owner correction; heterogeneous execution dates, often unknown. Not a claim of simultaneous2026-09-13 execution."}

Explore this index

Benchmark measurements 17Published values in each benchmark’s own units.

17 measurements

Solar Open 2 250B published benchmark measurements
Benchmark	Result	Published configuration	Source
AA Long Context Reasoningstandard	62.3%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
AIME 20262026	95.7%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
APEX-Agents-AAstandard	16.6%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
Cultural and Linguistic Intelligence in Koreanstandard	90.7%	Solar Open 2 250B (high)Solar Open 2 card Korean table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
HAE-RAE Math 8Kstandard	92.2%	Solar Open 2 250B (high)Solar Open 2 card Korean table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
KMMLU-Prostandard	78.4%	Solar Open 2 250B (high)Solar Open 2 card Korean table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
GDPval-AA v2 (Elo)v2	1,128 Elo	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · reference-only
GPQA DiamondDiamond	86.3%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
HMMT Feb 20262602	93.9%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible
Humanity's Last Examwithout tools	28.8%	Solar Open 2 250B (high)Solar Open 2 card English table	Solar Open 2 250B model card ↗Observed 2026-08-15 · checked 2026-08-15provider-reported · ranking-eligible

Showing 10 of 17 measurements

Specifications & source recordsDocumented model details and original references.

Model ID / checkpoint: upstage/Solar-Open2-250B
Weight access: Open weights
Context window: 1,000,000
Maximum output: Not documented
Modalities: text
Details checked: 15 Aug 2026

Solar Open 2 250B model cardUpstage · checked 15 Aug 2026 · source-checked

Specialist task evidenceSeparate agent runs and execution conditions.

No specialist task observations retained for this model.

The capabilities behind the model.

Capabilities, price & speed.

Capabilities versus API price

Capabilities versus output speed

Sources & model details.

Capabilities

Reasoning

More from Upstage.

Solar Pro 4

Solar Pro 3

Solar Open 100B (Reasoning)

The capabilities behind the model.

Capabilities, price & speed.

Capabilities versus API price

Capabilities versus output speed

Sources & model details.

Capabilities

Reasoning

More from Upstage.

Solar Pro 4

Solar Pro 3

Solar Open 100B (Reasoning)