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Model A
Claude Opus 4.6

Anthropic

69/100

Supported · Public rank #22

90% interval 58.0–80.0

Claude Opus 4.6 vs Solar Open 2

Updated September 10, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.

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Model B
Solar Open 2

Upstage

—

Evidence status unavailable

90% interval unavailable

Decision reading

At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner.

4 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.

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Which one for your work

Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.

No workload recommendation clears the current evidence threshold.

Use the matched evidence, workload costs, and sourced specifications below instead of treating a point score as a universal answer.

Show secondary and unsupported calls

  • Coding work

    Code generation, repair, and software-engineering tasks

    Not enough matched evidence

    Solar Open 2 is not ranked on the public lane for coding, so no winner is named for coding.

    Confidence: limited

  • Agentic work

    Tool use, computer use, and multi-step task completion

    Not enough matched evidence

    Solar Open 2 is not ranked on the public lane for agentic, so no winner is named for agentic.

    Confidence: limited

  • Long documents

    Prompts that approach the documented context limit

    No clear pick

    The documented context windows are equal.

    Confidence: documented

  • Chat turn cost

    1K fresh input + 500 output tokens

    Not enough matched evidence

    A complete comparable API-rate estimate is not available for both models.

    Confidence: listed-rates

  • Cache-heavy agent loop cost

    200K cached + 20K fresh input + 10K output tokens

    Not enough matched evidence

    A complete comparable API-rate estimate is not available for both models.

    Confidence: rate-fallback

  • Repository review cost

    50K fresh input + 3K output tokens

    Not enough matched evidence

    A complete comparable API-rate estimate is not available for both models.

    Confidence: listed-rates

What is actually comparable

Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.

Shared results
4
Claude Opus 4.6 only
29
Solar Open 2 only
7
Like-for-like categories
0 / 8

Category results, on a stated basis

Each row shows the public-lane category score for both models: the BenchAlign lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.

Agentic

Not comparable
Claude Opus 4.6
50.1
Supported · #56/152
Solar Open 2
Not ranked
Basis
BenchAlign lane · 9 vs 3 public rows
Reading
Not comparable

Coding

Not comparable
Claude Opus 4.6
56.6
Supported · #37/151
Solar Open 2
Not ranked
Basis
BenchAlign lane · 8 vs 2 public rows
Reading
Not comparable

Reasoning

Not comparable
Claude Opus 4.6
67.1
Unranked · 2 rankable rows
Solar Open 2
Not ranked
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Knowledge

Not comparable
Claude Opus 4.6
61.0
Estimated · #34/183
Solar Open 2
Not ranked
Basis
BenchAlign lane · 9 vs 3 public rows
Reading
Not comparable

Math

Not comparable
Claude Opus 4.6
58.6
Unranked · 3 rankable rows
Solar Open 2
Not ranked
Basis
Provisional lane · 2 vs 2 weighted rows
Reading
Not comparable

Multilingual

Not comparable
Claude Opus 4.6
Not ranked
Solar Open 2
Not ranked
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Multimodal

Not comparable
Claude Opus 4.6
59.5
#28/48
Solar Open 2
Not ranked
Basis
Provisional lane · 1 vs 0 weighted rows
Reading
Not comparable

Instruction following

Not comparable
Claude Opus 4.6
52.6
#78/123
Solar Open 2
Not ranked
Basis
Provisional lane · 0 vs 1 weighted rows
Reading
Not comparable

Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign) differ from the provisional-lane categories. Unranked scores sit on the lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.

Shape of the matched evidence

Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.

Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.

What each workload costs

Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.

Chat turn

1K fresh input + 500 output tokens

Claude Opus 4.6
$0.0175
Fits in one request
Solar Open 2
Self-hosted; infrastructure cost varies
Fits in one request

Solar Open 2 has no comparable published API token rate.

Repository review

50K fresh input + 3K output tokens

Claude Opus 4.6
$0.325
Fits in one request
Solar Open 2
Self-hosted; infrastructure cost varies
Fits in one request

Solar Open 2 has no comparable published API token rate.

Cache-heavy agent loop

200K cached + 20K fresh input + 10K output tokens

Claude Opus 4.6
$1.35
Fits in one request
Cached input priced at the published list-input rate
Solar Open 2
Self-hosted; infrastructure cost varies
Fits in one request
Cached-input rate unavailable

Claude Opus 4.6 has no published cached-input rate, so cached tokens use its listed input rate. Solar Open 2 has no comparable published API token rate.

Specification differences

Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.

Cached-input rate

A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.

Claude Opus 4.6

Not published

Solar Open 2

No comparable hosted API rate

Upstage Solar Open 2 model card

Documented inputs

Claude Opus 4.6

Not sourced

Solar Open 2

Not sourced

Documented outputs

Claude Opus 4.6

Not sourced

Solar Open 2

Not sourced

Provider availability

Claude Opus 4.6

Not sourced

Solar Open 2

Not sourced

Reasoning profile

Claude Opus 4.6

Non-Reasoning

Solar Open 2

Reasoning

Weight access

Claude Opus 4.6

Proprietary

Solar Open 2

Open Weight

License

Claude Opus 4.6

Proprietary

Solar Open 2

Open Weight

Release date

Claude Opus 4.6

2026-02-01

Solar Open 2

2026-07-22

If you already use one of these models
Deployment change
The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
Quality signal
At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner.
Workload cost
A complete comparable API-rate estimate is not available for both models.
Context tradeoff
Both models list 1M.

Run the same representative tasks against both endpoints before changing production traffic.

Benchmark evidence

The full public result ledger is available for audit without forcing a wide desktop table onto a phone.

Browse raw public benchmark evidence40 rows

Agentic

  • Terminal-Bench 2.0

    Claude Opus 4.665.4%
    Source
    Solar Open 2—

    Not directly comparable

  • BrowseComp

    Claude Opus 4.683.7%
    Source
    Solar Open 2—

    Not directly comparable

  • OSWorld-Verified

    Claude Opus 4.672.7%
    Source
    Solar Open 2—

    Not directly comparable

  • Claw-Eval

    Claude Opus 4.670.4%
    Source
    Solar Open 2—

    Not directly comparable

  • DeepSearchQA

    Claude Opus 4.673.7%
    Source
    Solar Open 2—

    Not directly comparable

  • CyberGym

    Claude Opus 4.666.6%
    Source
    Solar Open 2—

    Not directly comparable

  • Gert Labs

    Claude Opus 4.661.85%
    Source
    Solar Open 2—

    Not directly comparable

  • ResearchClawBench

    Claude Opus 4.619.9%
    Source
    Solar Open 2—

    Not directly comparable

  • JobBench

    Claude Opus 4.636.7%
    Source
    Solar Open 2—

    Not directly comparable

  • terminalBenchHard

    Claude Opus 4.6—
    Solar Open 228.3%
    Source

    Not directly comparable

  • APEX-Agents

    Claude Opus 4.6—
    Solar Open 216.6%
    Source

    Not directly comparable

  • MCP Atlas

    Claude Opus 4.6—
    Solar Open 258.2%
    Source

    Not directly comparable

Coding

  • SWE-bench Verified

    Claude Opus 4.680.8%
    Source
    Solar Open 270.4%
    Source

    Claude Opus 4.6 leads this result

  • SWE-bench Verified*

    Claude Opus 4.675.6%
    Source
    Solar Open 2—

    Not directly comparable

  • LiveCodeBench Pro

    Claude Opus 4.670.7%
    Source
    Solar Open 2—

    Not directly comparable

  • SWE-bench Pro

    Claude Opus 4.653.4%
    Source
    Solar Open 2—

    Not directly comparable

  • SWE-Rebench

    Claude Opus 4.665.3%
    Source
    Solar Open 2—

    Not directly comparable

  • React Native Evals

    Claude Opus 4.684.1%
    Source
    Solar Open 2—

    Not directly comparable

  • Vibe Code Bench

    Claude Opus 4.657.57%
    Source
    Solar Open 2—

    Not directly comparable

  • FrontierCode 1.1 Main

    Claude Opus 4.626.9%
    Source
    Solar Open 2—

    Not directly comparable

  • LiveCodeBench v6

    Claude Opus 4.6—
    Solar Open 292.4%
    Source

    Not directly comparable

Knowledge

  • GPQA

    Claude Opus 4.691.3%
    Source
    Solar Open 2—

    Not directly comparable

  • GPQA-D

    Claude Opus 4.689.2%
    Source
    Solar Open 286.3%
    Source

    Claude Opus 4.6 leads this result

  • SuperGPQA

    Claude Opus 4.695%
    Source
    Solar Open 2—

    Not directly comparable

  • MMLU-Pro

    Claude Opus 4.682%
    Source
    Solar Open 286.2%
    Source

    Solar Open 2 leads this result

  • MMLU-Pro (Arcee)

    Claude Opus 4.689.1%
    Source
    Solar Open 2—

    Not directly comparable

  • HLE

    Claude Opus 4.653%
    Source
    Solar Open 2—

    Not directly comparable

  • HLE w/o tools

    Claude Opus 4.640%
    Source
    Solar Open 228.8%
    Source

    Claude Opus 4.6 leads this result

  • HealthBench Hard

    Claude Opus 4.614.8%
    Source
    Solar Open 2—

    Not directly comparable

  • MedXpertQA (Text)

    Claude Opus 4.652.1%
    Source
    Solar Open 2—

    Not directly comparable

Math

  • AIME25 (Arcee)

    Claude Opus 4.699.8%
    Source
    Solar Open 2—

    Not directly comparable

  • FrontierMath v2 (Tiers 1-3)

    Claude Opus 4.640.700%
    Source
    Solar Open 2—

    Not directly comparable

  • FrontierMath v2 (Tier 4)

    Claude Opus 4.622.900%
    Source
    Solar Open 2—

    Not directly comparable

  • HMMT Feb 2026

    Claude Opus 4.6—
    Solar Open 293.9%
    Source

    Not directly comparable

  • AIME26

    Claude Opus 4.6—
    Solar Open 295.7%
    Source

    Not directly comparable

Multimodal

  • MMMU-Pro

    Claude Opus 4.677.3%
    Source
    Solar Open 2—

    Not directly comparable

  • ERQA

    Claude Opus 4.651.6%
    Source
    Solar Open 2—

    Not directly comparable

  • ScreenSpot Pro

    Claude Opus 4.683.1%
    Source
    Solar Open 2—

    Not directly comparable

  • MedXpertQA (MM)

    Claude Opus 4.664.8%
    Source
    Solar Open 2—

    Not directly comparable

Instruction following

  • IFBench

    Claude Opus 4.6—
    Solar Open 280%
    Source

    Not directly comparable

Frequently asked questions

Which is better, Claude Opus 4.6 or Solar Open 2?

At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner. The page therefore keeps the decision tied to the specific documented workload.

Which is better for coding, Claude Opus 4.6 or Solar Open 2?

Solar Open 2 is not ranked on the public lane for coding, so no winner is named for coding.

Which is better for agentic tasks, Claude Opus 4.6 or Solar Open 2?

Solar Open 2 is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.

Which costs less, Claude Opus 4.6 or Solar Open 2?

Both models do not have comparable published API token rates, so this page does not name a universal price winner.

Which has the larger context window, Claude Opus 4.6 or Solar Open 2?

Both models list the same context window, 1M.

Related comparisons

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Last updated September 10, 2026

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