Alternatives · 15 models compared · checked 17 Aug 2026
Claude Opus 4.5 alternatives: 15 models in or near grid F3
The closest model to Claude Opus 4.5 on the atlas is Claude Sonnet 4, in the same square, at $3.00 per 1M input tokens against Claude Opus 4.5’s . 10 of the 15 nearest models are cheaper on input; the cheapest is Codestral 2508 at $0.30. We rank by position on the atlas, not by capability, because we hold no capability data.
$5.00
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ModelsAtlas. “Claude Opus 4.5 alternatives: 15 models in or near grid F3”. Retrieved 17 Aug 2026. https://modelsatlas.com/models/anthropic/claude-opus-4-5/alternatives
Where the alternatives sit
Each square is a price band (A–H) × a context band (1–6). How the grid works
Same squareGRIDF31 modelClaude Sonnet 4
Claude Opus 4.5Its 15 nearest modelsOther modelsOpen weights
View the map as a table (5 squares)
| Square | Price band | Context band | Models |
|---|---|---|---|
| GRIDD3 | $0.30–1 | 128–256K | Codestral 2508 |
| GRIDE3 | $1–3 | 128–256K | Claude Haiku 4.5, Grok Build 0.1, o3 Mini High, o4 Mini, o4 Mini High, Nano Banana Pro (Gemini 3 Pro Image), o3, Command A |
| GRIDF3 | $3–10 | 128–256K | Claude Opus 4.5, Claude Sonnet 4 |
| GRIDF4 | $3–10 | 256K–1M | GPT Chat Latest, GPT-5.4 Image 2 |
| GRIDG3 | $10–30 | 128–256K | Claude Opus 4, Claude Opus 4.1, o1 |
Top 15 alternatives
Ranked by steps away on the atlas, then cheaper before pricier, then input price
| # | Model | Grid | Why it fits | Input / 1M | vs Claude Opus 4.5 | Output / 1M | Context | |
|---|---|---|---|---|---|---|---|---|
| — | Claude Opus 4.5Anthropic · the model you’re replacing | GRIDF3 | Baseline | $5.00 | — | $25.00 | 200K | |
| 1 | Claude Sonnet 4Anthropic | GRIDF3 | Same maker, same square, 40% cheaper input | $3.00 | −40% | $15.00 | 200K | Compare → |
| 2 | Claude Haiku 4.5Anthropic | GRIDE3 | Same maker, neighbouring square E3, 80% cheaper input | $1.00 | −80% | $5.00 | 200K | |
| 3 | Grok Build 0.1xAI | GRIDE3 | Neighbouring square E3, 80% cheaper input, 1.3× the context | $1.00 | −80% | $2.00 | 256K | |
| 4 | o3 Mini HighOpenAI | GRIDE3 | Neighbouring square E3, 78% cheaper input | $1.10 | −78% | $4.40 | 200K | |
| 5 | o4 MiniOpenAI | GRIDE3 | Neighbouring square E3, 78% cheaper input | $1.10 | −78% | $4.40 | 200K | |
| 6 | o4 Mini HighOpenAI | GRIDE3 | Neighbouring square E3, 78% cheaper input | $1.10 | −78% | $4.40 | 200K | |
| 7 | Nano Banana Pro (Gemini 3 Pro Image)Google | GRIDE3 | Neighbouring square E3, 60% cheaper input | $2.00 | −60% | $12.00 | 131K | Compare → |
| 8 | o3OpenAI | GRIDE3 | Neighbouring square E3, 60% cheaper input | $2.00 | −60% | $8.00 | 200K | Compare → |
| 9 | Command ACohere | GRIDE3 | Neighbouring square E3, 50% cheaper input, 1.3× the context | $2.50 | −50% | $10.00 | 256K | Compare → |
| 10 | GPT Chat LatestOpenAI | GRIDF4 | Neighbouring square F4, same input price, 2× the context | $5.00 | same | $30.00 | 400K | Compare → |
| 11 | GPT-5.4 Image 2OpenAI | GRIDF4 | Neighbouring square F4, 60% pricier input, 1.4× the context | $8.00 | +60% | $15.00 | 272K | Compare → |
| 12 | Claude Opus 4Anthropic | GRIDG3 | Same maker, neighbouring square G3, 200% pricier input | $15.00 | +200% | $75.00 | 200K | Compare → |
| 13 | Claude Opus 4.1Anthropic | GRIDG3 | Same maker, neighbouring square G3, 200% pricier input | $15.00 | +200% | $75.00 | 200K | Compare → |
| 14 | o1OpenAI | GRIDG3 | Neighbouring square G3, 200% pricier input | $15.00 | +200% | $60.00 | 200K | Compare → |
| 15 | Codestral 2508Mistral AI | GRIDD3 | 2 squares away (D3), 94% cheaper input, 1.3× the context | $0.30 | −94% | $0.90 | 256K |
What switching saves
3,000 input + 800 output tokens × 1,000 requests a day
Σ Derived from standard-tier prices; excludes caching and batch discounts. Use your own numbers →
Larger-context alternatives
| Model | Input / 1M | Context | |
|---|---|---|---|
| Grok Build 0.1xAI | $1.00 | 256K | |
| Command ACohere | $2.50 | 256K | Compare |
| GPT Chat LatestOpenAI | $5.00 | 400K | Compare |
| GPT-5.4 Image 2OpenAI | $8.00 | 272K | Compare |
| Codestral 2508Mistral AI | $0.30 | 256K |
Free alternatives
| Model | Input / 1M | Context | |
|---|---|---|---|
| Lyria 3 Clip PreviewGoogle | Free | 1.05M | |
| Lyria 3 Pro PreviewGoogle | Free | 1.05M |
Compare Claude Opus 4.5 head to head
Questions
What is the best alternative to Claude Opus 4.5?
Claude Sonnet 4 ranks first: same maker, same square, 40% cheaper input. Input is $3.00 per 1M tokens against $5.00 for Claude Opus 4.5. Ranking is by position on the atlas, not by quality.
What is the cheapest alternative to Claude Opus 4.5?
Codestral 2508 at $0.30 per 1M input tokens, 94% less than Claude Opus 4.5, among the 15 closest.
Is there an open-weight alternative to Claude Opus 4.5?
None of the 15 closest is marked open-weight in our records.
Which alternative has a larger context window?
GPT Chat Latest, GPT-5.4 Image 2, Grok Build 0.1, Command A and 1 more hold more than Claude Opus 4.5's 200K; the largest is GPT Chat Latest at 400K.
How are alternatives ranked?
By distance on the atlas grid from Claude Opus 4.5's square F3: the same square first, then neighbouring squares. Within the same distance, cheaper models come before pricier ones, then the lowest input price wins. We hold no capability data, so we do not claim a model can do what Claude Opus 4.5 does, only that it costs and holds about the same. No vendor pays for position.
More alternatives
Keep going in your AI
Opens with this page as the source. We add nothing else to the prompt.
- What is the best alternative to Claude Opus 4.5?
- What is the cheapest alternative to Claude Opus 4.5?
- Is there an open-weight alternative to Claude Opus 4.5?